An extraordinary natural landscape of mountains, waterfalls, and rocky cliffs riddled with tunnels.

When the rain falls, this drain system turns into a musical instrument.

Ruins of a German Castle on top of a towering stone pillar.

This iconic 1,000-year-old medieval castle is a favorite of the film industry, most notably as the location for Hogwarts in Harry Potter.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

This "preacher's pulpit" once used for pagan ritual, is home to a new, and dangerous ritual.

These secluded and abandoned anti-aircraft defenses have become one the most scenic viewpoints in Barcelona.

The world's largest reflecting pool is just two centimeters deep.

This Welsh village gave itself a ridiculous name in a publicity stunt a century ahead of its time.

A tiny church on a man-made island in the Adriatic.

This Nazi-built amphitheater was constructed on a sacred mountain site used by various German cults.

An obscure waterfall that looks like something out of a fantasy novel.

Architectureal fantasy quarter of Rome.

The attic of a four-century-old canal house hides a clandestine church.

Over 2,000 ancient temples dot the Myanmar landscape at the site of this famed archaeological site.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

An Aztec temple, the largest man-made pyramid in the world, sits buried in earth with a Spanish church set on top.

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

These historic defenses ensured the city within would survive hundreds of years of occupations, sieges, and invasions.

A natural arch offers panoramic views of Yangshuo's karst hills.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

If you’ve ever seen a picture of Machu Picchu, then you’ve seen a picture of Huayna Picchu—you just didn’t realize it.

An extraordinary mixture of natural beauty and man-made phenomena.

This fantastical waterfall is hidden in a cave located in a cracked cliff.