A Jurassic artscape composed of transmission casings and other mechanical parts.

See prehistoric footprints, plus two complete mastodon skeletons.

Often referred to as the largest spring in America.

The deepest spring in Missouri.

Red sandstone structures dominate this landscape, which has been inhabited for some 5,000 years.

A toweringly silly piece of modern art has been delighting locals since the 1980s.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Strange red rock formations that have been attributed to a higher power for hundreds of years.

This Hindu temple is an architectural marvel designed and built according to ancient Indian principles.

This painted blacktop brings the classic arcade game to life.

A museum dedicated to the history and exploration of both popular music and science fiction.

The ancient sauropod tracks found in this former quarry are some of the largest in the world.

Florida might be at its most surreal in this museum devoted to the famed Spanish artist.

An underwater city for the dead.

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

These old stone ruins in the Oregon wilderness were once bathrooms and are steeped in legends of murder.

On the Oregon coast there is a natural hole that seems to be draining the sea.

This small museum is home to some of the oldest and best-preserved dinosaur specimens found in Montana.

Mounds of fine golden sand that can rise nearly 500 feet tall.

A piece of baseball history is preserved in a Pittsburgh parking lot.

Home to fossils and other specimens from the Western Interior Seaway.

A physical reminder of Earth's ancient past, this rock results from the photosynthetic processes of some of the oldest forms of life.

The longest step street in the city.