This memorial park stands on the site of one of the largest mass executions of the Second World War.

A Red Cross memorial museum at the site of the Niš concentration camp that operated for four eventful years during World War II.

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

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

A Serbian church lit by chandeliers made of weapons.

Micro-nation based around a nine-story high illegally built tower.

A landscape decorated with enormous skull sculptures.

A darkly erotic open-air statuary in Catalonia.

700 iron sculptures crammed into a Mediterranean park.

Lithuania's outdoor sculpture trail of wooden folk art.

What happens when you cross a mayor and a painter?

No need to strap in for a "ride" on this walkable roller coaster.

A small church ornamented with medieval erotic sculptures.

A small town Romanian cemetery filled with darkly humorous gravestones.

Do these monsters look familiar? The gargoyles on this church are all from pop culture.

Enter the cabin of a life-sized Hindenburg replica.

A living art gallery painted on a canvas of Monterey pine trees.

Two monstrous faces loom over a village in Czechia.

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

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

These warring psychedelic crags commemorate an unsuccessful military operation.

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

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

This historic cemetery was inaccessible for several years due to dozens of land mines.