"The most colorful grottoes of the world.

A tree-like building perches on its trunk in the Steglitz neighborhood of Berlin.

Skeletons dressed in extravagant 18th century royal costumes cavort in the aisles of this German basilica.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

A striking 12th-century-style castle built on the edge of a cliff.

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

An abandoned NSA listening post on Berlin's "Devil's Mountain."

A collection of abandoned typographic signs from Berlin and beyond.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

The birthplace of an eccentric alchemist and possible inspiration for the fictional reanimator of monsters.

A surreal museum of extraordinary industrial objects.

A slice of central Asia in the middle of Berlin.

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

On a trail in Portugal's Barão de São João National Forest, a pile of faces look up at hikers from the forest floor.

This unassuming chapel in Portugal plays host to a ghoulish collection of bones.

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

The extravagance of Portugal’s "Pink Palace" resulted in a noble title being awarded to its owner.

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