Article: Rock on! The Grand Canyon has a gigantic reason to celebrate. This month marks its 100th anniversary as a national monument! In this GeoTrek, find out what makes the canyon unique.(SPECIAL REPORT)

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 landscape." says Andy Pearce, an environmental education specialist at the canyon. "There really is ...

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