Martin Bricelj Baraga's monolithic sculpture measures the blueness of the sky, and changes color to match it.

This abandoned Slovenian military barracks has become a punky-political art squat.

A whimsical bridge adorned with decorative dragons.

A miniature train-ride through Slovenia's largest cave system.

This one-time health resort was used by aristocrats around the world.

This massive subterranean fissure is known as the "underground Grand Canyon."

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

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

This Transylvanian church has changed its denomination four times.

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

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

Packed to the ceiling with antique taxidermy and hunting arms.

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

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

A Romanian church built from one single oak.

A collection of items from a way of life that no longer exists.

A stunning 18th century pharmacy and medieval chemist's collection.

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

Something's watching you.

The Natural History Museum that time forgot.

A giant portrait of an ancient king looms over the river.

Some call this eerie forest of crooked trees the "Bermuda Triangle of Romania."

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).