A 90-foot-tall psychedelic "tree" on the side of the highway has baffled passersby for decades.

Largest man-made excavation on earth!

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

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

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

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

The longest living non-clonal organisms on Earth.

This railroad magnate's 19th century tower is more than a little bit out of place in the Nevada desert.

Singing sand that stands as the final remains of an ancient lake.

Only intact Ichthyosaur skeleton in the United States.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

Trails through lava-carved tube-caves display sparkling bacteria and a rich history.

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

Quite simply the largest tree in the world (by volume).

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

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

A hotel and restaurant serving as the mecca of kitsch.

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

A strange house built only at night, with rumored mystic inspiration.

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