The world’s narrowest house makes for an awkward, four-foot-wide living space.

17th century palace once a meeting place for politicians.

A medieval church built up to defend its village.

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

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

Something's watching you.

The legendary cliffside castle of three-time Voivode of Wallachia, Vlad the Impaler.

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

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

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

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

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

A somber memorial honors the hundreds of thousands of lives lost at this labor and extermination camp.

Pop culture has helped to keep this iconic British building from being destroyed.

Warsaw's fantastically preserved gasworks...almost.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

A hands-off space for graffiti artists to hone and display their skills.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

Time stands still at this serene burial ground in the center of Budapest.

A museum in the childhood house of a medical pioneer.

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

The abandoned "Red Star Train Graveyard" is the final rusting place for precious artifacts of train history.