A 19th-century subterranean reservoir repurposed as a contemporary art cave.

This pair of gilded girls atop an Art Deco building in Copenhagen were built to function as a weather indicator.

Museum on earth sciences featuring a recreation of a famous curiosity cabinet.

The final resting place of the author who gave us the Little Mermaid, the Ugly Duckling, and many more beloved fairy tales.

The final resting place of one of the brightest physicists of the 20th century.

This sublime architectural marvel is a rare example of an expressionist church.

This Danish rock field is actually a sprawling ancient cemetery holding the bodies of 700 Vikings.

Tiring of digging out the door to this church for every service, it was eventually abandoned to the sands.

The northernmost point in Denmark is a turbulent sandbar created by two clashing seas.

Italian cave with exceptional acoustics and an unsavory history.

Built on a medieval synagogue, this church has a burial crypt, tunnel system, and Jewish ritual bath hiding deep underneath.

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.

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

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

In the sleepy town of Gozo exists a reproduction of the entire town of Bethlehem.

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

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

At more than 5,000 years old, these structures are among the oldest free-standing stone buildings in the world.

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

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

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

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

These lesser-known Maltese catacombs date back over 1,700 years.