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

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

This Transylvanian church has changed its denomination four times.

Climbing to the top of the cathedral's bell tower offers sweeping views of these medieval ruins.

Something's watching you.

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.

This hill made entirely of ancient Roman jars was simply a garbage dump to the people of the time.

The "Great Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

More sculpture than building, this architecturally significant temple was built on the spot of Saint Peter's crucifixion.

The studio built by fascists in the hopes of "reviving the film industry" with the occasional propaganda film opportunity thrown in.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

A dead saint, a deadly poison, and a mysterious holy ooze.

Macabre symbols of death and mummies on display set the tone of this Italian purgatory church.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

This off-beat, quirky communism-themed bar isn't afraid to poke fun at its history.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

The geographical center of Budapest is marked with a 10-foot-tall stylized zero.

This statue of a falling man commemorates a teenage martyr of the Hungarian Revolution.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.