By Audrina Bigos

CHICAGO (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

s091255138 Things That Turn Green On St. Patricks Day

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

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

The Colosseum

s091255145 Things That Turn Green On St. Patricks Day

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

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

The White House fountain

s091255149 Things That Turn Green On St. Patricks Day

The fountain on the North Lawn of the White House in Washington is dyed green.

The fountain on the North Lawn of the White House in Washington is dyed green.

The Chicago River

s091255156 Things That Turn Green On St. Patricks Day

It takes 40 pounds of dye to turn the Chicago River green. The dye is a secret recipe.

It takes 40 pounds of dye to turn the Chicago River green. The dye is a secret recipe.

The Empire State Building

s091255162 Things That Turn Green On St. Patricks Day

The iconic New York skyscraper is lit green, white and orange.

The iconic New York skyscraper is lit green, white and orange.

St. Patrick’s Day parades

s091255169 Things That Turn Green On St. Patricks Day

Members of the County Carlow Association ride horses past St. Patrick’s Cathedral on 5th Avenue in New York.

And of course, green is the dominant color in March 17 parades around the world. Here, members of the County Carlow Association ride horses past St. Patrick’s Cathedral on 5th Avenue in New York. The city’s St. Patrick’s Day parade, dating back to 1762, is often called the world’s largest.

© 2018 Cable News Network, Inc., a Time Warner Company. All rights reserved.

Watch & Listen LIVE