This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

An eerie, derelict amusement park in Berlin.

Metro station with a claim to rock n' roll fame.

A Soviet-style monument, built after transferring the remains of heroes from their graves.

An abandoned sanatorium building from the early 20th century sits in the forest of the Rila mountains.

A crumbling monument to a now locally-extinct sport in Bulgaria's oldest ski resort.

While it would not look out of place among Serbian spomeniks, this massive Bulgarian monument commemorates one of their defeats.

At almost 900 feet long, this is Bulgaria's longest suspension bridge and the only way to reach the small village of Lisitsite.

Now a ruin, this grand resort was coveted by a communist autocrat and an eccentric Japanese golfer.

The Bulgarian royal family exclusively used this ornate, now-abandoned train station.

A dragon-shaped fountain that is said to dispense healing water—unless you're evil.

A supersonic jet stands on a pedestal in this rural village as a monument to military aviation.

The temple that withstood the Nazis.

This rose and lavender oil distillery still operates as it did more than a century ago.

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

An homage to the medieval rulers of Bulgaria.

Founded in the 4th-century, the town of Pernik plays host to the Surva Carnival⁠—a magnificent display of masked Kukeri dancers.

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

A massive cave once a secret military base is now home to thousands of bats.

Rebuilt several decades ago, its striking murals prevent it from being reconsecrated as a church.

One of the largest mines in Bulgaria is now home to a vast museum more than 100 feet underground.

These cascading falls resonate throughout the Bulgarian forest.

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.