The site of one of the largest prison escapes of World War II.

A somber memorial honors the hundreds of thousands of lives lost at this labor and extermination camp.

A miniatures park with a model of Wolf's Lair as it looked during World War II.

This Nazi ruin was the site where Hitler was almost blown up by a suitcase bomb.

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

The two abandoned overpasses are among the largest bridges in Poland.

Built to transport German U-boats through the never-completed Masurian Canal, the locks near this Polish village are now home to a rope course.

An abandoned football stadium with a tragic past.

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

The site of the first battle of World War II.

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

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

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

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

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

This sprawling concrete suburb of Kraków was designed by the Soviet Union as the model proletarian city.

No matter how many times this community-run sauna gets destroyed, it always rises from the ashes.

Villas that once served as playgrounds for the rich now fall away in decay.

A crumbling bakery where forced laborers from the nearby concentration camp toiled to feed their fellow prisoners and Nazi soldiers.

An abandoned swimming pool decays on the outskirts of Berlin.

This strategic isle was once swapped between empires and almost entirely destroyed in a bomb explosion.

Twisted trees shaped by coastal winds make this woodland look like something from a spooky story.

The simple auditorium that launched a pop icon's career into the stratosphere.

An extraordinary final resting place full of oversized art, amazing statues, and dead celebrities.