Things that turn green on St. Patrick's Day

Updated 0554 GMT (1354 HKT) March 17, 2019

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(CNN)Every year on St. Patrick's Day, the world around us suddenly looks a little ... jealous.

It's not just Kermit the Frog or the Incredible Hulk or that guy in your office with the green necktie. It's green food, green parades, green fountains and famous sites around the world that take on a greenish glow.
There are numerous theories as to why green became the color of the holiday. It is one of the colors on the Irish flag. Green also is the color of a shamrock, a symbol of Ireland -- known as the Emerald Isle because of its lush vegetation. And traditional Irish legend held that wearing green made you invisible to leprechauns.
Regardless of the reason, the world unites around the color green on St. Patrick's Day. Here are some of the most notable green landmarks.

Rio's Christ the Redeemer

The 98-foot-tall statue in Rio de Janeiro gets a green glow.

The Colosseum

Rome's 2,000-year-old stadium takes on a green look.