This Edwardian workhouse tells a harrowing story of those who were forced to trade hard labor for lodging.

This abandoned building, which is the second-largest structure on the Maltese island of Comino, has a complicated past.

Berliners converted a bombed-out, disused lot into a community-run urban farm with its own cafe and bar.

A wunderkammer of mysterious objects and stories.

Started as a kitchen garden, now the second largest botanical garden in the world.

Designed to resemble foreign architecture, this mosque-looking structure was used to pump water to a royal fountain.

A stone from Africa's tallest peak is immortalized in a Potsdam palace—but is it actually the mountaintop?

Solar observatory doubles as a daring display of Expressionist architecture, much to Einstein's chagrin.

A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

From cartoon characters to tiny tanks, a guerilla sculptor's little bronze statues are hidden throughout the city of Budapest.

This magnificent castle grew from a small Moorish fortress, and reportedly inspired two iconic Disney castles.

A hidden medieval crypt where a famous legend says the devil used to teach black magic.

An unusual but excellent display created in the 1930s as propaganda against the Freemasons.

This star-shaped military outpost is now simply trying to protect itself from neglect.

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

Rare karst landscape eroded from a flat seabed.

Asthmatic Charles Hyett's son built a fantastical garden for his father to convalesce in, alas it was too late.

Puzzles within puzzles hide a golden treasure in this hedge maze.

This medieval sanctuary's tree-framed door looks like a portal to a mythical realm.

This medieval manor house was equipped with secret compartments for hiding priests.

The first museum in Europe dedicated to the art of origami.

A living art gallery painted on a canvas of Monterey pine trees.

A landscape decorated with enormous skull sculptures.