This 40-room dwelling tucked within a cliff was built by the basin's prehistoric residents.

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

Despite a legend that says this highest peak in Oregon was climbed in high heels scores of people have died on its slopes.

Meet manatees face-to-face at this zoo for native species.

One of the American Southwest's most extensive collections of Navajo rock art.

In upstate New York, gorgeous waterfalls and a watermill are slowly being reclaimed by nature.

A ruined mansion hidden in the woods of the Hudson Valley, home of a tragically doomed romance.

Preserving the remains of Native American cultures which otherwise would have been submerged behind Hoover Dam.

This stunning blue and gold room changed cities twice before becoming part of the Smithsonian.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

The highest point in Washington state is a volcano covered in glaciers.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

An abandoned town is hidden in Great Smoky Mountains National Park.

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

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

This amazingly preserved Gold Rush town is a historian's dream.

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

The summer home of the largest colony of bats in the world.

This cave holds a surprisingly colorful variety of geological oddities.

This sacred cavern, 400 feet deep, is home to millions of bats and an ancient burial ground.

Shoreline strewn with the remains of ghostly fallen trees.

The drama of nature in full effect in this Nevada State Park.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

This 29-ton granite ball spins around at the slightest touch thanks to a scientific phenomenon.