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

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

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

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

A unique tribute to the millions of animals who served and died for the British military.

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

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

Once an opulent Art Nouveau hotspot, the Constanța Casino is one of Romania's most beautiful abandoned buildings.

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

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

A small town Romanian cemetery filled with darkly humorous gravestones.

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

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

This African beach is home to thousands of rare mainland penguins that are known for their annoying voice.

A memorial to a dog that inspired rioting in the streets of London.

A memorial to the only dog ever officially enlisted in the Royal Navy.

A community of artists and entrepreneurs seeks a simpler life on London's waterways.

Over 60 species of birds inhabit this colorful aviary park in South Africa.

An ancient impact crater on the outskirts of Pretoria.

The subterranean sanctuary home to local shamans is a sacred site for people of all religions.

Environmentally crucial raptors like eagles and vultures are kept and protected in this massive sanctuary.

One of the tallest buildings in Africa provides a great view of Johannesburg's unique geography.

This road winds through the steep coastal cliffside offering spectacular views for those who brave the drive.

The South African dialect's complex history is immortalized in stone, in one of the world's only monuments dedicated to a language.