This bone-filled cave got its name after they found 140 bear skeletons inside.

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

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

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

The Natural History Museum that time forgot.

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

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

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

Even drowned in an ocean of toxic waste, the remnants of this Romanian village stand tall.

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

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

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

The romantic botanic tunnel feels like a well-kept secret.

A countryside Romanian cemetery filled with colorful crosses bearing lyrical, ironic, or satirical rhymes.

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

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

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

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

Moss and stone turn this waterfall into an otherworldly liquid veil.

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

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.

Soviet General Zhukov’s former home is a quiet spot amid the heavy traffic of Ulaanbaatar.

A hike outside of the town of Zuun Mod will take visitors to a monastery complex steeped in Mongolian history.