Macabre museum devoted to historical Viennese murders.

The remains of an entire Roman city can be explored in this interactive museum.

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

Mummified monks and the accidentally interred, in a 17th-century crypt.

Europe's second largest ossuary wasn't discovered until 2001.

Crosses of all shapes, sizes and colors litter the mountain, the site of a huge yearly Orthodox pilgrimage.

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

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

A Trabant car, a kangaroo statue, and a plethora of plants take over this abandoned-factory-turned-bar.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

The Natural History Museum that time forgot.

Hungarian mummies in beautiful painted coffins.

In northeastern Poland, the ruins of a massive granary overlook the Narew River.

Thanks to its heroic service during WWII this Soviet castle has been turned into a monument towered over by a brutalist titan.

The world’s narrowest house makes for an awkward, four-foot-wide living space.

The massive white mound and accompanying water terraces are a striking geological oddity.

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

The biggest exposition of dental equipement in Europe. And a Mummy.

This castle played host to the largest great hall found in medieval Central Europe.

Inside the Šomoška National Nature Reserve exists a unique rock formation rarely seen in the world.

After 11 years of reconstruction work, Slovakia's finest hilltop chapel complex is finally reopen to the public.

An unusual cave filled with rare alien-looking aragonite formations.

Brought to you by the makers of fiberglass dinosaurs.

The 700-year-old fortress was the site of Count Orlok's castle in "Nosferatu."