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

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

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

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

A centuries-old forgotten underworld lies beneath Malta.

This spectacular dome managed to survive after being bombed in World War II, in an event known as the "Miracle of Mosta."

A hidden tunnel of bones in one of Malta's oldest churches.

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

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

An abandoned set from the 1980 film "Popeye," claimed and repurposed as a theme park by creative locals.