Defining Moments: Capturing our changing world

By Monica Sarkar and Ivana Kottasova, CNN

Updated 1045 GMT (1845 HKT) May 20, 2015
Defining moments -- Chelsea Flower ShowDefining moments -- Chelsea Flower Show
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MAY 20 -- LONDON, ENGLAND: A Chelsea Pensioner takes a photo in the Sentebale 'Hope In Vunerability' Garden on the opening day the annual Chelsea Flower Show. The garden is inspired by the Mamohato Children's Center in Lesotho. Due to open later this year, the center will will provide support to children living with HIV. Chris Jackson/Getty Images
MAY 19 -- SYDNEY, AUSTRALIA: Taronga zoo welcomes the birth of a Western-lowland Gorilla. The species is under threat from poaching, hunting and infectious disease. As yet, keepers have been unable to get close enough to establish the gender of the new-born. Mark Kolbe/Getty Images
MAY 18 -- MELBOURNE, AUSTRALIA: The padlocks now seen on bridges around the world to commemorate a couple's love, has come to an end in Australia's second largest city. The council plan to remove 20,000 "lover's locks" because their weight is affecting the safety of Southgate footbridge. Pat Scala/Getty Images
MAY 15 -- BUENOS AIRES, ARGENTINA: Boca Juniors fans cheered their team on before the match against fierce rivals River Plate at the Bombonera Stadium. JUAN MABROMATA/AFP/Getty Images
MAY 14 -- FISCHBACHAU, GERMANY: Several thousand pilgrims, in traditional Bavarian folk dress, attend the annual Ascension Mass (Christi Himmelfahrt, in German) at an open-air altar. Philipp Guelland/Getty Images
MAY 13 -- CANNES, FRANCE: The red carpets await the feet of global celebrities ahead of the 68th annual Cannes Film Festival. The festival will open with Emmanuelle Bercot's "Standing Tall"-- only the second opener to be directed by a woman. Tristan Fewings/Getty Images
MAY 12 -- CHRISTCHURCH, NEW ZEALAND: Prince Harry helps the Student Volunteer Army hand out cupcakes during a visit to the University of Canterbury. The prince is in New Zealand attending events in Wellington, Invercargill, Stewart Island, Christchurch, Linton, Whanganui and Auckland. Martin Hunter - Pool/Getty Images
MAY 11 -- SEOUL, SOUTH KOREA: A child looks a little sleepy while attending the 'Children Becoming Buddhist Monks' ceremony at a Chogye temple ahead of Buddha's birthday. The children will stay at the temple to learn about Buddhism for 14 days. Buddha was born approximately 2,559 years ago, and although the exact date is unknown, Buddha's official birthday is celebrated on the full moon in May in South Korea, which is on May 25 this year. Chung Sung-Jun/Getty Images
MAY 8 -- BERLIN, GERMANY: Flowers are laid down at the Soviet War Memorial at Treptower Park in Berlin to commemorate the end of the Second World War 70 years ago. STEPHANIE PILICK/AFP/Getty Images
MAY 7 -- MOSCOW, RUSSIA: Red Square and Saint Basil's Cathedral stand illuminated during rehearsals ahead of celebrations to mark the 70th anniversary of the victory over Nazi Germany. Moscow will host a military parade among other events on May 9 to mark the occasion. Sean Gallup/Getty Images
MAY 6 -- ROME, ITALY: Members of the Harlem Globe Trotters basketball team pose before the arrival of Pope Francis for his weekly general audience at St Peter's square ANDREAS SOLARO/AFP/Getty Images
MAY 5 -- VENICE, ITALY: A visitor looks at 'The Key in the Hand' by Japanese artist Chiharu Shiota presented at Japan's pavilion at the 56th International Art Exhibition Biennale d'Arte, titled 'All the Worlds Futures'. The exhibition opens to the public on May 9 in various locations across the city. GABRIEL BOUYS/AFP/Getty Images
MAY 2 - ATLANTIC OCEAN: HMS Lancaster, known as the 'Queen's Frigate', sends a message of congratulations to the Duke and Duchess of Cambridge on the birth of their daughter. Royal Navy
MAY 1 -- LAS VEGAS: It's one day to go before the hotly anticipated fight between Floyd "Money" Mayweather and Filipino legend Manny Pacquiao. The pair will go toe to toe to be crowned undisputed world champion at Las Vegas's MGM Grand on Saturday. The winner will walk away with a share of an estimated $300,000 purse. JOHN GURZINSKI/AFP/Getty Images
APRIL 30 -- LONDON: Royalist Terry Hutt blows out the candles on a cake on his 80th birthday as he waits for a new royal baby at the Lindo wing of St Mary's Hospital. Chris Jackson/Getty
APRIL 26 - LONDON: Spectators watch through the glass floor of Tower Bridge as runners in the London Marathon pass by beneath their feet. Some 38,000 people raced along the 26.2 mile course which ends on The Mall in front of Buckingham Palace. Peter Macdiarmid/Getty Images
APRIL 25 - AUCKLAND, NEW ZEALAND: People pin poppies to the Cenotaph following the Dawn Service at the Auckland War Memorial Museum on ANZAC Day, the 100th anniversary of the 1915 Gallipoli landings. Phil Walter/Getty Images
APRIL 20 - ROME, ITALY: People belonging to historical groups and dressed as ancient Romans attend an event to mark the anniversary of the legendary foundation of the "eternal city" in 753 BC. FILIPPO MONTEFORTE/AFP/Getty Images
APRIL 14 - IZBA, SUDAN: Women wait for their turn to vote outside a polling station in an impoverished neighborhood on the outskirts of Khartoum, the capital city. This is the first day of the country's presidential and legislative elections, which could see current President Omar al-Bashir hold onto his leadership for another five years. AP Photo/Mosa'ab Elshamy
APRIL 9 - GEORGIA, UNITED STATES: Spectators walk along the first fairway before the first round of the revered Masters golf tournament at Augusta, which begins today. AP Photo/Matt Slocum
APRIL 7 - TOKYO, JAPAN: APRIL 07: Businessmen walk through an area used for 'Hanami' or flower-viewing parties on the final day of the cherry blossom season in Tokyo's Ueno Park. Chris McGrath/Getty Images
APRIL 7 - OURO PRETO, BRAZIL: Girls dressed as angels take part in the annual Easter procession during traditional Semana Santa (Holy Week) festivities. Holy Week marks Easter celebrations for Catholics and Brazil holds the largest number of followers of the faith. Mario Tama/Getty Images
APRIL 2 - ZAMORA, SPAIN: Penitents take part in the "Procesion del Silencio" (Procession of Silence) by the "Cristo de las Injurias" brotherhood, during the Holy Week. Hundreds of processions take place throughout Spain during this time. AP Photo/Andres Kudacki
APRIL 2 - HIMEJI, JAPAN: Tourists take part in 'Hanami' or flower-viewing parties under cherry blossom trees in full bloom in the grounds of Himeji Castle. According to tradition during the Hanami season, people gather wherever cherry blossom trees are blooming and enjoy food and drinks often well into the night. Buddhika Weerasinghe/Getty Images
APRIL1 - MAE HONG SON, THAILAND: Shan, or Tai Yai, boys take part in a ceremony during the Poy Sang Long festival -- a Buddhist novice ordination ceremony of the ethnic group in the Shan state in Myanmar and northern Thailand. Young boys aged between 7 and 14 are ordained as novices to learn the Buddhist doctrines. Taylor Weidman/Getty Images
MARCH 31 - CHONGQING, CHINA: People take photos of the solar-powered aircraft Solar Impulse 2 at Chongqing Jiangbei International Airport. The aircraft, the first to be completely sustained by the sun's rays, took off from Mandalay, Myanmar's second biggest city, early Monday. It is the fifth flight of a landmark journey to circumnavigate the globe. ChinaFotoPress/ChinaFotoPress via Getty Images
MARCH 30 - DAURA, NIGERIA: A young girl from the Hausa tribe waits while her mother joins a queue to validate voting cards at a polling station in an Islamic school. The station is in the home town of opposition presidential candidate Muhammadu Buhari. Votes were being counted Monday after Nigerians went to the polls to cast their votes in one of Africa's biggest elections. AP Photo/Ben Curtis
MARCH 26 - KAZAKHSTAN: An Orthodox priest conducts a blessing service in front of the Soyuz TMA-16M spacecraft at the Russian-leased Baikonur cosmodrome. The new Soyuz mission is scheduled for March 28. AP Photo/Dmitry Lovetsky
MARCH 25 - SHANGHAI, CHINA: Alexa Scimeca and Chris Knierim of the United States perform during the Pairs Short Program in the ISU World Figure Skating Championship. This year's competition is held at the Oriental Sports Center. AP Photo/Ng Han Guan
MARCH 24 - HYDERABAD, INDIA: An artist puts the final touches to statues of Hindu Gods Rama, his brother Lakshman, wife Sita and devotee Hanuman at a workshop ahead of the Rama Navami festival. Celebrations will be held on March 28, commemorating both the birth of Rama and his wedding to Sita. NOAH SEELAM/AFP/Getty Images
MARCH 23 - PRIZREN, KOSOVO: Women attend a ceremony marking Nowruz celebrations in a prayer room. Nowruz, which means "new day", marks the first day of spring and the beginning of a new year in the Persian calendar. ARMEND NIMANI/AFP/Getty Images
MARCH 19 - NEW YORK, U.S.: Dancers from the junior ensemble of Alvin Ailey American Dance Theater perform a scene from "Hissy Fits" during the New York season. TIMOTHY A. CLARY/AFP/Getty Images
MARCH 18 - PILISSZENTKERESZT, HUNGARY: The Northern Lights (Aurora Borealis) are seen above Dobogoko in the town of Salgotarjan. The best places to spot auroral displays are over the southern tip of Greenland and Iceland, the northern coast of Norway and over the coastal waters north of Siberia. AP Photo/MTI,Balazs Mohai
MARCH 17 - BALI, INDONESIA: Women offer prayers during a religious ceremony called Melasti. The ritual, in which the faithful carry a holy Hindu symbol to the sea to be purified, is performed ahead of the Hindu Day of Silence. AP Photo/Firdia Lisnawati
MARCH 16 - MANAGUA, NICARAGUA: A woman waves the Venezuelan national flag in front of a monument honoring Venezuela's late President Hugo Chavez. A march led by President Daniel Ortega took place to show solidarity with the country. AP Photo/Esteban Felix
MARCH 13 - BEIJING, CHINA: A man naps in the corridor of the Great Hall of the People during a plenary session of the National People's Congress. The annual gathering is long on pomp and circumstance but short on legislative deliberation; while some voting takes place, the Communist Party's proposals are always approved. AP Photo/Ng Han Guan
MARCH 12 - GYERYONG, SOUTH KOREA: A military officer runs to his position during the joint commission ceremony of thousands of new military officers of the army, navy, air force and marines at the military headquarters. AP Photo/Lee Jin-man
MARCH 11 - RURUTU, FRENCH POLYNESIA: The Moerai School choir gather as they wait to sing the national anthem and raise the national flag during a visit by French Overseas Territories Minister George Pau-Langevin. This is the minister's first official visit to the South Pacific Ocean territory. GREGORY BOISSY/AFP/Getty Images
MARCH 10 - MUSCAT, OMAN: A Swiss solar-powered plane lands in Oman after it took off from Abu Dhabi early Monday, marking the start of the first attempt to fly around the world without a drop of fuel. Solar Impulse founder Andre Borschberg was at the controls of the single-seater for the 400-kilometer (250 mile) flight. AP Photo/Jean Revillard and Olga Stefatou, Solar Impulse
MARCH 9 - TEHRAN, IRAN: A woman walks past a wall bearing stains of exploded firecrackers from last year's annual fire festival, or Chaharshanbe Soori, held on the eve of the last Wednesday before the Persian new year of Norooz. The tradition follows the Persian solar calendar and will be celebrated this year on March 21. BEHROUZ MEHRI/AFP/Getty Images
MARCH 5 - TEL AVIV, ISRAEL: An acrobat performs during the Purim festival. The Jewish holiday commemorates the Jews' salvation from genocide in ancient Persia, as recounted in the Book of Esther which is read in synagogues. Other customs include sending food parcels and giving charity, dressing up in masks and costumes, eating a festive meal and public celebration. AP Photo/Ariel Schalit
MARCH 4 - PATHUM THANI PROVINCE, THAILAND: Buddhist monks pray and gather at Wat Phra Dhammakaya temple to participate in Makha Bucha Day ceremonies. The religious holiday marks the anniversary of Buddha's mass sermon to the first 1,250 newly ordained monks. AP photo/Sakchai Lalit
MARCH 3 - GAPYEONG-GUN, SOUTH KOREA: Thousands of couples take part in a mass wedding of the Family Federation for World Peace and Unification, commonly known as the Unification Church, at Cheongshim Peace World Center. Approximately 3,800 couples from around the world exchanged their vows in the wedding claimed by the Church to be one of its largest ever. Chung Sung-Jun/Getty Images
MARCH 2 - MANILA, PHILIPPINES: Revelers place colored powder on a woman's face as they celebrate the Holi festival in Pasay, south of Manila. The event is led by Indian nationals as they mark the spring occasion, also known as the festival of colors. AP Photo/Aaron Favila
FEBRUARY 27 -- BARSANA, INDIA: Hindu men from the village of Nandgaon throw colored powder at each other as part of the region's Lathmar Holi festivities. During Lathmar Holi, men from Nandgaon -- said to be the home of the Hindu god Krishna -- tease women from neighboring Barsana -- the home of Krishna's consort, Radha. In response, Barsana's women "beat" the men with wooden sticks. AP Photo/Saurabh Das
FEBRUARY 26 - SANAA, YEMEN: Schoolgirls attend a class as efforts are made to improve access to education in the country, particularly for girls. 2015 has been declared by the Yemeni Prime Minister Khaled Bahah as the "Education Year," despite the financial and political challenges faced. UNICEF claims to have reached 193,000 children last year with interventions to improve their learning environment. MOHAMMED HUWAIS/AFP/Getty Images
FEBRUARY 25 - BEIJING, CHINA: Women wearing traditional costumes wait prior to a show at Ditan Park temple fair during the Chinese Lunar New Year. Millions of Chinese are celebrating the Spring Festival, the most important holiday on the country's calendar, which marks the beginning of the Year of the Sheep in 2015. FRED DUFOUR/AFP/Getty Images
FEBRUARY 24 - ATHENS, GREECE: Local revelers celebrate Clean Monday with a flour war, a unique, colorful event marking the end of the carnival season in the port town of Galaxidi, about 133 miles (214 km) west of Athens. The flour fight takes place at the beginning of the 40-day Christian Lent fast. AP Photo/Petros Giannakouris
FEBRUARY 23 - OKAYAMA, JAPAN: Men wearing nothing but loincloths cram into the Saidiji Temple for the Hadaka Matsuri, or Naked Festival. In a tradition dating back some 500 years, those taking part battle to grab one of two lucky talismans thrown by a Shinto priest. The winners are said to be blessed with good fortune for the next year. Trevor Williams/Getty Images
MAY 1 -- LAS VEGAS: It's one day to go before the hotly anticipated fight between Floyd "Money" Mayweather and Filipino legend Manny Pacquiao. The pair will go toe to toe to be crowned undisputed world champion at Las Vegas's MGM Grand on Saturday. The winner will walk away with a share of an estimated $300,000 purse. JOHN GURZINSKI/AFP/Getty Images