The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

This top-secret nuclear bunker hidden in a Bosnian mountain has been converted to a modern art exhibition space.

This surreal memorial/cemetery is a necropolis of crumbling stonework and puzzle-shaped headstones.

The sad remains of a monument to martial arts legend and movie star Bruce Lee—in the middle of Balkans.

Bridge that died in war and was resurected.

There's a mini version of Iguazu Falls hidden in the Balkans, and it's got a rope swing.

These warring psychedelic crags commemorate an unsuccessful military operation.

An ancient knight and a symbol of the city's freedom.

A wunderkammer of gold and silver reliquaries and ancient saintly bones.

Gargoyle head that brings good luck.

A curious cave church carved into the face of a cliff.

A tiny church on a man-made island in the Adriatic.

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

A beautiful mountaintop mausoleum devoted to a Montenegrin icon can't seem to make everyone happy.

Once the fallout shelter of a dictator, this sprawling bunker is now a combined history museum and contemporary art gallery.

One of the world's oldest olive trees, thought to be over 2,000 years old.

This exclusive resort has completely covered a tiny Balkan island in a 5-star warren of guest rooms.

This elaborately decorated, fairytale-like Romanian royal palace is one of the most striking castles in Europe.

The deepest sinkhole in Central Europe comes with a grisly tale and an unusual nickname: “The Stepmother Abyss.”

Bohemian paradise covered in majestic forests.

A church of bones, decorated with 40,000 human skeletons.

Sitting beneath an unremarkable residential building is a museum devoted to classic Pinball.

This Hungarian stilt village is built in a lake that never freezes over due to the power plant that that uses it as a cooling pond.

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