London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

The music is over at the Ballhaus Riviera Ballroom, but the ballroom remains in haunting disrepair.

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

An eerie, derelict amusement park in Berlin.

Every part of this unusual home is built into the sandstone rock.

The 14th-century ruins are said to contain healing powers.

A spiral staircase twists to the top of this unusual Czech lookout tower.

Thirty creepy ghosts now inhabit this decaying 14th-century church.

Two stunning 17th-century libraries and a cabinet of curiosities.

Ruins of an early Roman Christian church dating back to the 4th to 5th centuries.

"Unity, Creativity, Beauty."

This massive stone and steel monument remembers a century-old battle that cost thousands of lives and nearly destroyed the city.

Mysterious standing stone formations looks like a petrified forest.

This once-grandiose behemoth of a monument from the socialist era now sits quiet and closed up.

A collection of art from Bulgaria's time as a communist state.

The ceiling of Prohodna Cave in northern Bulgaria affords a peek at the sky via two deity-sized-eye-shaped holes.

This massive concrete sculpture is said to be the heaviest communist monument on Earth.

The second-largest Jewish temple in Bulgaria was deserted after World War II, seized by the communist government and then abandoned again.

In a long-dry lake bed, these groups of massive stone pillars bear a striking resemblance to clumps of everyone's favorite fungi.

An ancient Thracian city where fire rituals were practiced on the largest cult altar in Southeast Europe.

An architectural marvel that spans the Arda River, and has stories of a haunted past.