Nazis in Poland

An extensive network of secret tunnels was created for the Nazi project "Riese."

At night, this memorial illuminates a ghostly outline of a footbridge that connected two sections of the Warsaw Ghetto.

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

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.

This now-defunct synthetic fuel plant was once a major cog in the Nazi war machine.

A 90-ton, gravity-defiant steam locomotive shoots for the skies in this bizarrely beautiful public artwork.

The final resting place of the last "gypsy king" of Poland.

A statue honors the children who fought Nazis in Poland.

A tribute to the Polish insurgents who fought in the failed attempt to end their city's Nazi occupation.

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

This open-air museum was originally a World War II testing ground for German missiles and rockets.

A mysterious structure left behind on the Polish mountainside, sometimes called "Hitler's Stonehenge".

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

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

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

The unsettling remnants of a torn down movie set lies nearby the ruined location of the actual Płaszów Labor Camp.