A maze of crosses marks the jumbled divide between the Netherlands and Belgium.

This crumbling Portuguese ruin overlooks the populace it once ruled.

The verdant mossy ruins of a Franciscan monastery lie in the remote Sintra hills awaiting exploration.

This small chapel is built of human bones and decorated with a golden skeleton.

Dead weights honor the dead of Portugal's fishing industry.

Eccentric sculpture garden brings Basque mythology to life.

Figures of unknown origin carved into the surfaces of underground caves.

These narrow stone granaries have been used to store and dry out grain for hundreds of years.

A stunning 18th-century site where pilgrims ascend by a series of punishing stairs only to return via funicular.

These giant sculptures are supported by a bizarre menagerie of feet.

The only statue ever crafted by award-winning animator Ray Harryhausen.

An unusual stone chair can be found on the banks of the River Wear, not far from Durham Cathedral.

The many—66 to be exact—faces of the German forest.

These blingy, baubled skeletons lie in glass boxes inside a baroque Bavarian church.

One of New Zealand’s few castles boasts beautiful gardens, grand architecture, and a history filled with family drama.

A German apartment building hosting as many trees as human occupants.

The entrance to this Frankfurt subway station looks like an old tram car crashed into the concrete sidewalk.

At this cemetery, artists are invited to design their own gravestones.

A sprawling Baroque park with 300-year-old hydro-pneumatic waterworks.

The medieval institution is home to the precious treasure stolen in World War II in one of the greatest art thefts of the 20th century.

This Communist-era residential block is one of the longest residential building in Europe.

The coffin-shaped church was once home to monks who slept in coffins.

This honeycomb-textured tafone looks like a petrified troll head.

Pigduck of Turku.