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

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

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.

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

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

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

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

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

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

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.

Among fossils of creatures long since cast into oblivion, a once-single frog perseveres for his species.

A mysterious ancient network of thousands of perfectly straight lines stretching across miles of Bolivian desert.

Mountain of unimaginable riches that bankrolled the Spanish Empire, complete with its own underworld god.

Thousands of fossilized footprints speckle this Bolivian national park.

This hotel is located on the edge of the world's largest salt flat and is made out of the only material around.

An ancient Incan convent on Lake Titicaca's Island of the Moon.

The soaring gondola lines form the longest aerial cable car system in the world.