This almost-forgotten underground dungeon housed several convicts over the years, including Caravaggio.

The medieval home is still engraved with the symbol of the profession, an eye flanked by two axes.

Italian cave with exceptional acoustics and an unsavory history.

142 ceramic steps become a mosaic once a year.

A mysterious ancient elephant said to possess magic powers is now the symbol of a Sicilian city.

"Stairs of the Turks", a chalky white cliff eroded conveniently into stairs, allowing for easy pillaging.

This unassuming retro burger joint was billed as “diner of the future” at the 1939 World's Fair.

This constantly evolving art space saved an Italian town from its own crippling reputation.

A centuries-old forgotten underworld lies beneath Malta.

Abandoned Roman Catholic chapel abused by Satanists before being restored.

This subterranean necropolis holds three floors of antler-dug grave caves.

The floor of this spectacular Baroque sanctuary is covered in memento mori.

The ruins of a megalithic monument sit right in the garden of a luxurious Maltese resort.

Ancient mysterious ruts carved in the bedrock.

Burial grounds for more than 1,000 bodies deep under the modern town of Rabat.

This unique building in the main square stands out among the city's typically Baroque architecture.

Overshadowed by other, more famous Maltese catacombs, this ancient burial chamber has one of the best examples of a ritual agape table.

The remains of a 1st-century aristocratic Roman town house featuring beautiful well-preserved mosaics.

This Stone Age solar temple aligns with the sun on each equinox and solstice.

Enigmatic tombs and cave dwellings on the outskirts of a rural village.

Two geological phenomena in one precarious locale: a towering stone window, and a deep blue void.

The fishing boats that moor in this small lagoon enter and leave through a tunnel to the sea.

These temples are among the oldest free-standing stone buildings in the world.

This prison on the Maltese island of Gozo is almost 500 years old, and they have the graffiti to prove it.