A beautiful 19th-century mansion slowly crumbled and became a 'ghost house' after World War II.

The oldest church in Serbia was also the ecclesiastical seat of the region during the Middle Ages.

Once a beautiful palace, this structure is now known as the ''museum of destruction."

The final resting place of one of the first alleged vampires.

A grand Yugoslav memorial to the group of partisans who fought and died resisting western Serbia’s Nazi occupation.

For over 40 years, this quaint little house has teetered on a rock in the middle of a river.

A pair of connected skyscrapers form this symbolic gateway.

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

Legends of treasure and spirits flow from this this fairy tale-like oasis.

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

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

Not far from a popular beach, an unfinished, abandoned mansion for Bulgaria's last communist dictator.

This apartment is a true time capsule of local life in Bulgaria during the Soviet regime.

Massive, unfinished broadcasting station stands as a monument to the fall of communism.

An unfinished complex built for children from around the world sits abandoned on the Black Sea coastline.

This massive stone and steel monument remembers a century-old battle that cost thousands of lives and nearly destroyed the city.

Outstanding, eerie frescoes and decorations fill this 19th-century monastery.

This once-grandiose behemoth of a monument from the socialist era now sits quiet and closed up.

A collection of art from Bulgaria's time as a communist state.

The ceiling of Prohodna Cave in northern Bulgaria affords a peek at the sky via two deity-sized-eye-shaped holes.

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

An abandoned saucer-shaped monument in the Bulgarian mountains.