The world's greatest slide descends 18 stories from this looping mountaintop viewing platform.

This copy of the famous Prague Astronomical Clock is the result of one man's passion project.

This renaissance château was home to an infamous witch hunter who sent a hundred suspected witches to their deaths.

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

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

In the center of Wrocław's old meat market stands a somber tribute to the city's livestock.

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

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

Enormous sandstone towers loom within a Czech forest.

On this Polish road, an optical illusion makes cars seem to roll uphill.

This formerly-prosperous Silesian mining town was completely demolished in the late 1960s and early 1970s as an attempt to cover up a secret Soviet uranium mine.

This abandoned but well-preserved Prussian fortress sits abandoned in a Polish forest near the German border.

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