The best-preserved ancient theater in the world.

Once described as the "Eagle's Nest," this ruined ancient city rests on a remote mountaintop.

Ottoman-era houses lovingly preserved.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

A memorial museum to the political prisoners who were held at Sighet Prison, once one of the most feared places in Romania.

The preserved arm of a third-century sorcerer is believed to have the power to lift curses and spells.

Romania's only crater lake with water as pure as if distilled.

A muddy alien landscape that is home to rare species of exotic plants.

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

Romania's "Red Ravine" is a little-known natural wonder that bears a resemblance to the Grand Canyon.

A spooky spot along the road where things mysteriously seem to move uphill by themselves.

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

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

Packed to the ceiling with antique taxidermy and hunting arms.

This eccentric folly house was designed by Romanian thinker Bogdan-Petriceicu Hasdeu, with a helping hand from his deceased daughter's spirit.

The growing stones of Romania.

Check out engineering marvels of the past at this unintentionally retrofuturist museum.

Romania's triumphal arch looks out over Bucharest.

Gigantic Romanian salt mines used to heal respiratory conditions.

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

The Natural History Museum that time forgot.

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

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

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