One person's lost luggage is another person's treasure.

A lush green oasis in the middle of Chicago.

A monument to the art of slicing people open.

Each year these high desert hills are absolutely covered with poppy flowers in a surreal show of nature.

The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

The world's longest known cave system.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

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

Behind this beachfront shop lies a spectacular, colorful sea cave with an equally colorful past.

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

A giant bronze coil of feces is both a tribute to doggie defecation and a reminder to pick it up.

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

Two thousand artifacts from around the world collected by one woman who loved to travel.

A hotel and restaurant serving as the mecca of kitsch.

Franciscan monks created a facsimile of the Holy Land for North Americans who couldn’t afford the trip overseas.

Where manatees are the snowbird vacationers in these balmy Florida springs.

This strange seaside tower got its name from a wealthy eccentric who would hide coins among its stones.

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

This upscale streetwear store is hidden behind a fake Snapple machine in the back of a deli.

One of the world's oldest and most massive living organisms is a grove of quaking aspens.

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

Take a drunken tour inside the world's largest known geode.

A castle that was built stone by stone by an eccentric journalist.

A favorite haunt of dinosaur loving children and hallucinogen loving hippies alike.