The vast, legendary catacombs hold secrets much stranger than stacked bones.

Five candy-colored villages on the Italian Riviera.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

A small museum that celebrates the history and culture of the LGBTQ community in England.

This supermarket offers shoppers a window into the past alongside their groceries.

Every equinox this Maya pyramid puts on a spooky ancient light show.

On Japan's Tashirojima Island, cats are king.

Peek into a cave of giant, glimmering crystals.

A well-preserved network of cavernous tunnels have spent silent centuries removing Toronto's waste.

The mummies of a fake priest and bandit's wife are among the abundant curiosities at this museum.

Denmark’s never-ending bridge.

An ancient city exhumed from the depths of the ocean.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

One of the oldest continuously-operated gay bars in the United States is allegedly haunted by Truman Capote and Tennessee Williams.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

This impressive system of tanks was used to store drinking water as long as 2,000 years ago.

This beautiful system of tunnels built into natural rock serves as a centuries old plumbing system.

On the walking path from Monterosso to Vernazza, a small shrine dedicated to feline friends.

Centuries-old bridges grown from tangled roots.

This everlasting lightning storm may be the world's largest generator of ozone.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.

Granny Smiths and Fujis can both be traced back to Kazakhstan, where apples still grow wild.

Communism's topsy-turvy effect on Poland has been brought to life in this wacky tourist trap.

In this century-old literary safehouse, print is alive and well.