Get out your party hats and saddle up your mules. It's celebration time at the Grand Canyon! This year marks the 100th anniversary of when the canyon became a national monument.

National monuments are landmarks that are protected by the government. U.S. President Theodore Roosevelt declared the canyon a national monument on Jan. 11, 1908.

A century later, the Grand Canyon is still rocking. Nearly 5 million tourists travel each year to see the Grand Canyon. At more than a million acres, it's one of the world's largest canyons.

"It's a unique ...

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