The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

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

A beautiful geyser under environmental threat.

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

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

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

The only structure left with direct ties to the Salem witchcraft trials of 1692.

The ghostly remains of an accidental sea.

A snapshot of the city's fascinating voodoo culture.

An emerald-green grotto just a short trip from Austin.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

Controversially claiming the title of world's biggest bass drum, UT's Big Bertha was once made radioactive by the Manhattan Project.

The biggest drug trafficking passage between Mexico and the U.S.

The water in this preserved area spawns vegetation that gives it a deep green color.

Belly up to the bar in Cowtown, don't forget to buy some boots.

Established in 1925, Kiddie Park claims to be the oldest amusement park in the U.S. - a cozy little time warp nestled in a shady corner of the modern world.

Official museum, hall of fame, and repository of the Texas Rangers.

Modern technology and live displays tell the story of the Pacific during WWII for the Internet generation.

Three hundred years of preserved Spanish colonial history in San Antonio.

The Grand Canyon of Texas.

A mysterious drive-in nestled in the forest that leaves little to the imagination.

Decaying military base deactivated in the 70s is now visited by urban explorers and military enthusiasts.