A state-of-the-art medical facility from the Imperial era is now a derelict ruin.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

Ruins of a German Castle on top of a towering stone pillar.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

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

A whimsical and twisted animatronic monster tour beneath the streets of Berlin.

An eerie, derelict amusement park in Berlin.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

No one knows who built this strange cave of worship or exactly why.

Conspiracy theories and occult legends surround this mysterious natural rock formation.

This enormous abandoned prison was once dubbed the "Bastille of Romania."

This once-derelict building is now one of the most beautiful bookstores in the world.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

A whimsical art tower at a Bavarian brewery includes a grotto for its mythical beer-brewing dwarves.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

This solitary monastery may hold the remains of Vlad the Impaler (but probably not).

A small town Romanian cemetery filled with darkly humorous gravestones.

This fairy-tale castle would make Dracula (who is said to have been imprisoned there) jealous.

This massive underground salt mine now holds a sci-fi theme park in its depths.

Moss and stone turn this waterfall into an otherworldly liquid veil.

This elaborately decorated, fairytale-like Romanian royal palace is one of the most striking castles in Europe.

Once an opulent Art Nouveau hotspot, the Constanța Casino is one of Romania's most beautiful abandoned buildings.