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

A unique geological area spiked with wind-carved rocks that resemble teepees.

Natural sonic phenomenon comes with a grisly legend of murder and blood.

Earth's tallest volcano is sacred to Native Hawaiians, and home to a dozen world-class observatories.

A working cattle ranch with remarkably well-preserved prehistoric petroglyphs and ancient ruins.

The only way to see Pittsburgh is from the top of this lookout point, just like the ancient members of the native peoples did.

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

A gothic palace of endless stalagmites and pseudoscorpions waits within one of the world's most beautiful caves.

One of the best places to see feral Colonial Spanish Mustangs in the United States.

These ruins of a pre-Columbian cliff village are among the most beautiful and well preserved in New Mexico.

The remote outlaw hideout of Jesse James, Butch Cassidy, and the Sundance Kid.

The enormous 250-room Vanderbilt mansion conceals hidden doors and secret passageways.

A Texas cave network is home to some of the world's most spectacular-looking and bizarrely named mineral formations.

The unbelievably opulent home built for an infamous newspaperman.

Standing in a state of "arrested decay," this ghost town allows for a detailed peek into Gold Rush life in an unusually harsh climate.

This historic national park is covered in the stunning ruins of red rock pueblos.

This naturally heated mountainous creek has created a group of neon blue pools of potentially deadly boiling water.

This concert pavilion on the shore of the Great Salt Lake has been destroyed by fire, water, and disinterest but keeps coming back.

The Grand Canyon of Texas.

This Colorado hiking trail provides a small gold mine of abandoned gold mines.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

A stealthy Apache hideaway that became the haunting site of a mass grave.

One of the last Jazz Age "Wonder Theaters" in New York City.

A 300-ship graveyard, with a few still visible at low tide.