This unusual hostel provides a glimpse of life in a city under siege.

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

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

A forgotten and crumbling Yugoslav monument to the victims of fascism.

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

This unique structure allowed boats to bypass underwater mine barriers in the channel to enter the harbor.

Hidden in the forest are the remains of a former World War II chemical plant.

This unique bird reserve sits within an important fragment of Brazil's Atlantic rainforest.

Today this former Nazi concentration camp stands as a poignant memorial to the victims of fascism, and a warning from history.

A moving and macabre World War I-era painting by the great artist Otto Dix.

The largest collection of death masks in Ukraine.

Like something out of a bad acid trip, this Ukraine hallway has been covered in hallucinatory phantasmagoria.

A reconstructed medieval gateway that was the magnificent entrance to the capital city dating back to 1037.

A preserved oak tree about 3,500 years old found in Riga, Latvia.

Single runway interrupted by a busy road that cuts across its middle.

There was a top secret plan during World War II to seal a group of soldiers inside the rock.

Considered the birthplace of the Copper Age and Bronze Age, the river is tinted red from 5,000 years of mining.

This amended headstone marks the grave of a participant in one of the most successful military deceptions of all time.

Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.

Dead weights honor the dead of Portugal's fishing industry.

This small chapel is built of human bones and decorated with a golden skeleton.

This unassuming chapel in Portugal plays host to a ghoulish collection of bones.

A creepy statue of a hooded ghost hauls itself up from the water in a historic Lithuanian city.

A peculiar family mausoleum built by a German nobleman captivated by the occult.