Venice's island of the dead.

Hungarian self-built castle.

A fountain standing as a testament to a doomed alliance.

This legendary city has been a tourist attraction for centuries.

The hallucinogenic center of the ancient world.

Filled with goldfish swimming in a shallow pool of sea water, this ancient crypt is more wishing well than burial site.

On top of a resort town as old as the Bronze Age sits an incredible war memorial statue overlooking the beaches below.

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

This Croatian fairytale castle is slowly falling apart thanks to years of neglect.

Space-age monument to an early 20th-century uprising.

This massive concrete sculpture is said to be the heaviest communist monument on Earth.

These warring psychedelic crags commemorate an unsuccessful military operation.

This stunning, out-of-the-way Croatian monument commemorates a community's uprising against occupying fascist forces.

This huge metal monument is slowly being stripped to its concrete skeleton.

This brutalist monument is inscribed with 9921 names of Yugoslav partisans who perished during WWII.

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

Bridge that died in war and was resurected.

Bizarrely shaped rock formations in northwest Bulgaria come with equally bizarre legends.

A small town Romanian cemetery filled with darkly humorous gravestones.

One of the oldest churches in Romania is believed to have been built on the site of a pagan temple.

The bizarre rocks of Đavolja Varoš are the result of natural erosion.

A futuristic, brutalist masterpiece that is also strangely prison-like.

This 14th century castle withstood years of battle but is now sliding off the hills into the Danube.

This spaceship-like Serbian monument reaches for the stars in celebration of the fallen fighters of fascism.