Hidden beneath a restaurant, underground tunnels tell the story of Malta’s tragic role in World War II.

A centuries-old forgotten underworld lies beneath Malta.

This overgrown mountain village has been abandoned for nearly a century.

The oldest botanical garden in the world that technically isn't the oldest.

An open-air museum in a mountain valley features works designed to blend in with—and disintegrate back into—their natural surroundings.

An abandoned piece of phallic art repurposed by locals into a makeshift fertility shrine.

An unusual sculpture with a meaning shrouded in mystery.

Those who own or stay at this 500-year-old, allegedly cursed house often meet terrible fates.

A new sculpture calls attention to climate change in the centuries-old city it threatens.

Centuries ago, red and white wine poured from the statue's breasts whenever a new Venetian ruler was elected.

In Lago Superiore, the largest expanse of lotus flowers outside of Asia is hard to miss.

It’s said this crypt was the setting for the tragic finale of the Shakespeare play.

This Italian foot path winds through the mountains via 52 individual tunnels.

One of the largest caves in the world open to the public.

One of the tallest lighthouses in the world also serves as a monument to the fallen of World War I.

During World War II, this rice mill became a Nazi concentration camp.

These pools have been abandoned for over 20 years.

The only gulag ever to exist in socialist Yugoslavia.

This Croatian computer club features such gaming relics as the infamous Virtual Boy and an 8-bit Pacman machine.

The ruins of an abandoned crematorium haunt an eerie deserted German cemetery.

Yugoslavia's biggest underground airport lies in ruins.

A long abandoned hospital building on the outskirts of NYC.

An everyday Jackson Heights bodega conceals a Mexican seafood paradise.

This slender three-story building has also had several famous residents.