A turn of the century building boasting some of the most beautiful art nouveau architecture in Prague.

A Jenga-style cylindrical tower of books that appears to go on forever.

Macabre astrological automaton clock dating to the late 1400s.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

Bohemian paradise covered in majestic forests.

This unusually shaped mountaintop tower looks like a UFO floating over the city.

An unusual bronze bus shelter is actually an art installation commenting on the city's history with the Nazi party.

The soulless eyes of 82 bronze children stare on forever in remembrance of a horrifying World War II massacre.

The 14th-century ruins are said to contain healing powers.

An enormous and lavish Gothic church in Czechia.

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

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

A musical instrument played by the sea.

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.

The remains of the last Bosnian fortress to fall to the Ottomans are still standing.

This cluster of little wooden huts once ground local farmers’ wheat into flour during the days of the Austro-Hungarian Empire.

Bohol's mysterious brown hills.

An island in the middle of a lake, in the middle of a volcano, in the middle of a bigger lake, in the middle of a bigger island, in an archipelago, in the Pacific Ocean.

Five miles of underground river link lake to ocean.

The field of tiny caves that mark this Chinese cliffside are each their own historic Buddhist temple.

Thirty creepy ghosts now inhabit this decaying 14th-century church.