Housed in a former air raid shelter, this museum is dedicated to the history of computing and video games.

Along the edge of this fountain are 365 smaller fountains that represent the days of the year.

The house that took a plunge into the facade of a museum.

Baroque celebration of the end of the Great Plague of Vienna.

Legends surround an ancient tree trunk riddled with nails for good luck.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

A mechanical clock built in 1914, with a rotation of 12 historical figures on its face.

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

Nine centuries-old fortresses guard the walls of this medieval Romanian city.

This hauntingly beautiful cemetery outside a medieval citadel is full of winding paths and ivy-covered graves.

Known as the Hintz House, this medieval pharmacy has been an apothecary's haven for nearly 450 years.

This Transylvanian church has changed its denomination four times.

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

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

An ancient Roman snake god, carved expertly into stone.

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

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

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

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

A fire once nearly devoured this gorgeous 14th-century Gothic cathedral.

This snug medieval lane is one of the narrowest streets in the world.

17th century palace once a meeting place for politicians.

Romania's triumphal arch looks out over Bucharest.

The kitsch mansion of the former Romanian president Nicolae Ceaușescu features a golden bathroom.