Atop this library is one of the most beautiful green spaces in Warsaw.

A neo-Gothic church built to thank God for saving the Emperor of Austria from an assassination.

The meteor that sealed the fate of the dinosaurs landed at this site, one of the largest impact craters in the world.

The resting place for anonymous victims of the Danube's dark waters.

A spherical "micro-nation" in the heart of Vienna.

This abandoned mansion has a window for every day of the year, and is a temple for ghost hunters.

The last municipal pneumatic post system in the world was in operation for over 100 years, and may run again.

The first museum in the world devoted to sexual gadgetry.

Countless grotesque faces stare out from this eerie Prague art wall.

Unusual building appears to be haphazardly built from randomly piled bricks.

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

Europe's largest natural bridge has a 19th century royal chateau built into its side.

Bohemian paradise covered in majestic forests.

Two monstrous faces loom over a village in Czechia.