All that remains of this once-booming mining town are the ruins of a saloon.

These unknown Bronze Age earthworks are believed to be ancient burial mounds.

The oldest residential street in Europe also features an optical illusion.

These decaying bridges 1,000 feet high are a reminder of the skill it took to cross the Colorado Rockies by rail.

Hidden in the hills is a mysterious stone structure, known only to a few.

A disconnected rotary phone for "calling" lost loved ones offered a unique way of dealing with grief in disaster-stricken Japan.

A mountain of conch shells created by centuries of fishermen.

The island home of an unlucky whaling captain whose story inspired a great American novel.

It took 40 years to build this Eden-like garden in Marrakech, later restored by Yves Saint-Laurent.

The site of the first "historically true" UFO encounter in the U.S.

An acoustic anomaly with a mysterious cause.

A meditative space out of a fantasy story.

The first European statue dedicated to the legendary musician.

A New Hampshire grave with a grudge.

The remains of this castle, known as the Witch’s Eye, watch over the Thur Valley.

Home to the world's oldest wooden building.

A kaleidoscopic warehouse-maze of handmade neon signs.

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

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

This 170-year-old Swiss guesthouse built into the side of a mountain is best accessed by a cable car.

The world's only museum devoted to the wonders of fluorescence.

An ancient city exhumed from the depths of the ocean.

The only diamond mine in the world where you can keep what you find.

Each winter this underground cave forms a dazzling ice palace.