This landmark is a central figure in the Nez Perce origin story.

The first declared National Monument in the United States.

A place where the laws of nature seem to have gone completely berserk... but of course haven't.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

This giant iron playfully pays tribute to an early 20th-century architectural trend.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

A bizarre roadside attraction and the first instance of miniature golf in the world.

The whimsical construction on the roof has given rise to many a Montgomery myth about its contents.

Cadillac where country's first big star was found dead.

By day this New Orleans square is for pedestrians, but by night it is a kingdom of kittens.

This spectacular track has run continuously since 1882.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

The fifth-longest natural arch in the world, and the longest outside China.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

An overlooked monument to the celebrity gangster who helped put the sin in Sin City.

An exotic wildlife habitat right off The Strip.

A giant open-air sculpture made of over 200 full-sized boats.

Stepping away from the glitz of mobsters and casinos to learn about the other history of Vegas.

A spiritual vortex among the red rocks in Sedona.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

The ghostly remains of an accidental sea.