Medicinal spa created with the discharge from a geothermal energy plant.

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

Climbing to the top of the cathedral's bell tower offers sweeping views of these medieval ruins.

Once the legendary capital of the Dacian Kingdom, this city has been reduced to mere ruins.

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

This Romanian village may have been drowned, but it is long from forgotten.

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

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

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

Conspiracy theories and occult legends surround this mysterious natural rock formation.

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

This massive underground salt mine now holds a sci-fi theme park in its depths.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

A safari-themed castle in the South African bush with the largest maze in the southern hemisphere.

This beautiful waterfall is not easy to reach, but offers a stunning view of the pristine green valley.

Largest cave system in Africa.

All that remains of a Japanese fishing vessel that ran aground in 1982.

This small monument marks the divide between the Atlantic and Indian Oceans at the southernmost tip of Africa.

A growing popular hipster market with over 100 local specialties and live music.

Hidden in the hills is a mysterious stone structure, known only to a few.

Over a million items cram the shelves at Africa's largest shop of used and rare books.

A South African bar inside a hollowed out 6,000-year-old Baobab.