A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

An underwater restaurant, surrounded by a coral reef.

Climb this overlooked gem's spiral staircase and you'll be rewarded with spectacular views of Glasgow.

Walk through spectacular aisles of hanging meat and wagon wheel–sized cheese at the world's largest wholesale food market.

The only geyser in the state of Pennsylvania is caused by pressure from an abandoned coal mine outside of the ghost town Centralia.

Though strikingly beautiful, Seattle's other railway station is now largely forgotten.

More than five miles of underground passageways.

A moving tribute to a leader of the American abolitionist movement.

Walk up a ramp through a forest for panoramic views of Lake Michigan.

Exhibits from an island in Lake Michigan are preserved in this hand-built cabin museum.

This unauthorized stone mermaid was secretly carved out of public stone before being permanently preserved.

A swing to dangle you off the very edge.

A historic observatory precariously perched at the "Top of Europe."

On the cliffs of São Jorge in the Azores stand the remains of a lighthouse that was struck by a series of earthquakes.

In a 345-million-year-old cave that's 200 feet underground, dinner awaits.

This brick-lined pedestrian walkway was once a railway tunnel used during the Civil War.

Only a few pieces remain of a grand 16th-century water clock that once announced the changing hours with the sound of bells, gongs, and drums.

A medieval setting reimagined into a unique art alley.

The oldest operating roller coaster of its kind, the Montaña Suiza has been thrilling riders since 1928.

The historic bar where local ship captains, traders, and gold miners would come together to do business a century ago.

Packed with geological formations, an ancient river, and taxidermied seals, this overlooked coastal cave system is worth a spelunk.

One of the most scenic falls in Massachusetts has a history of death and grim legend.

This mosaic-lined medieval church was built by the world's first admiral and still holds mass in ancient Greek.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.