Largest collection of mounted dinosaur specimens in the world.

Once a menacing challenge for trailblazers, this trail is now the most scenic drive in Utah.

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

Dig for your own trilobites in this goldmine of invertebrates.

Bizarre lunar-like landscape with thousands of large stone "hoodoos."

Rippling sand dunes frozen in the Arizona rock.

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

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

A famous hotel houses an impression collection of mini dioramas and giant doll houses.

The vast, legendary catacombs hold secrets much stranger than stacked bones.