Hundreds of drawings left by the land's previous inhabitants remain mysterious.

Despite its name, this route in southern Utah offers a heavenly day trip.

A tunnel with windows, so you don't miss out on the impressive views.

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

Come for the speed, leave in love with the desert.

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

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

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

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

One of the world's oldest and most massive living organisms is a grove of quaking aspens.

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.

This quiet park's strange sedimentary spires were named after Kodak's color film.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A classically inspired temple in Redwood City.