
Jeddah Tower, Saudi Arabia —
The tower will be the crown jewel of Jeddah Economic City, a commercial and residential project of 57 million square feet (5.3 million square meters), that will feature homes, hotels and offices, as well as tourist attractions. Height: 3,280ft
Architect: Adrian Smith + Gordon Gill Architecture

Jeddah Tower, Saudi Arabia —
Construction of the landmark is estimated to cost $1.4 billion.Height: 3,280ft
Architect: Adrian Smith + Gordon Gill Architecture

Jeddah Tower, Saudi Arabia —
When the 3,280-feet-tall (1,000-meter-tall) Jeddah Tower opens in 2020, it will knock Dubai's iconic Burj Khalifa off its throne as the tallest skyscraper in the world by 236 feet (72 meters). Height: 3,280ft
Architect: Adrian Smith + Gordon Gill Architecture

The Tower, Dubai, United Arab Emirates —
"The Tower" will be built on the Dubai Creek Harbor, a massive new tourism development. The Tower will eclipse the Dubai's Burj Khalifa -- currently the tallest building in the world. Height: 928m (3,045ft)
Architect: Santiago Calatrava

The Tower, Dubai, UAE —
The expected completion date for The Tower in Dubai is 2020. Height: 928m (3,045ft)
Architect: Santiago Calatrava

The Tower, Dubai, UAE —
The building will hold several observation decks in its oval-shaped peak. One deck will offer a 360-degree view of the city. Height: 928m (3,045ft)
Architect: Santiago Calatrava

The Burj Khalifa, Dubai, UAE —
Currently world's tallest building, since it was completed in 2010, is the Burj Khalifa. It stands a massive 198 meters (650 feet) above its nearest competitor. Height: 828m (2717ft)
Floors: 163
Architect: Skidmore, Owings & Merrill

Mecca Royal Clock Tower Hotel, Mecca, Saudi Arabia —
Situated close to the Grand Mosque of the holy city of Mecca, the tower complex is one part of the $15 billion King Abdulaziz Endowment Project, seeking to modernize Mecca and accommodate the ever-growing number of pilgrims.Height: 601m (1972ft)
Floors: 120
Architect: Dar Al-Handasah Architects

One Vanderbilt Avenue, New York —
A new tall tower has broken ground in New York City. Named the One Vanderbilt Avenue tower, the building is designed by Kohn Pedersen Fox architects, and construction officially started today. At 1,401 feet tall, upon completion it will be the second tallest building in New York after the One World Trade Center.Height: 427m (1,401ft)
Architect: Kohn Pedersen Fox

Sky Mile Tower, Tokyo, Japan —
In February, a proposal for a mile-high tower in Tokyo was revealed. Height: 1,600m (5,250ft)
Architect: Kohn Pefersen Fox Associates and Leslie E Robertson Associates
