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

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

An eerie, derelict amusement park in Berlin.

Legend says a giant, venomous spider once dwelled within this Polish church.

Hundreds of notes give thanks to the patron saint of lost causes.

An open-air museum of 18th-century homes and churches transported from various villages in Southern Poland.

This hilltop ruin is of the hundreds of stone columns built in tribute to the first German chancellor.

Dubbed "Wistom" by locals, this abandoned factory is an urban explorer's dream.

At first glance, this area seems like just another city park, but the lush landscape hides a dark past.

An abandoned Jewish sanatorium is tucked within the woods of Poland.

This fairytale medieval church in Poland originally spent centuries in Norway.

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

A small granite monument marks where the borders of three countries meet.

A merchant court dedicated to the fictitious King Arthur is heavily adorned with bizarre Renaissance art.

A World War II torpedo launch station abandoned off the Polish coast.

One of the largest amphitheaters in Europe is a former Nazi gathering place that still stands today.

This imposing 20th-century castle was abandoned before it was ever completed.

A collection of old neon signs from all over Poland line a secluded courtyard.

This centuries-old wooden wonder was built in less than a year and is one of Europe's largest timber-framed churches.

Poland's oldest salt mine has nearly everything one needs to live underground forever.

What was once an underground Nazi city is now Europe's largest bat reserve.

Deep in a Polish forest, this collection of Iron Age megaliths still holds onto many of its ancient secrets.

A menacing statue of this mythical creature can be seen at the legendary site of the monster's lair.

A haunting deserted hotel is a favorite with artists and photographers.