This popular tourist cave was ignored for almost 200 years before being mined into an attraction.

The subtle interplay of fire and water is hard to ignore at this remote Jamaican spring.

This former shopping center now acts as the eccentric lair of the Venezuelan secret police and their shadow prison.

Costa Rican accommodation resembles a crash site, but with a nice balcony.

A beautiful deserted greenhouse in the middle of a park.

The secret medieval communication system will whisk your words above the noise of the crowd.

The tomb of one of the greatest travelers in history.

Home of the infamous Rug Man of Doha.

This unmarked and unloved Manhattan subway grate created one of the most iconic images in American cinema.

Rare recess caves fill this unbelievably beautiful Ohio park.

This historic Amsterdam bar used to accept sailor's monkeys as payment.

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

Countless grotesque faces stare out from this eerie Prague art wall.

Site of a classic 19th-century physics experiment to prove the earth is rotating.

The angel of death appears to weep black tears at this grave marker.

A century-old hotspot for jazz, frequented by everyone from Charlie Chaplin to Al Capone.

A stairway to heaven, or to nowhere at all.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world’s largest coastal brick fortresses.

An unusual, super-sized grocery adventure awaits in an Ohio suburb.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

Construction of Barcelona’s iconic (but controversial) church was finally completed in 2026—a century after the death of its architect.

A lovers' beach, tucked below the surface of the island, provides a safe haven for romance.

A silly medieval mural preserved on the side of a Viennese house.