This psychedelic tourist trap is a leisurely descent into madness.

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

These tombs were built into the side of a mountain so that ancient angels could reach the dead.

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

These tourist trap caverns are said to be the former home of a legendary Pennsylvania Hermit.

Three and a half miles of cliffs, rocky beaches, Gilded Age mansions and 40 Steps to nowhere in particular.

One of the windiest peaks in Crimea is home to an incredible set of cable bridges.

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

An Aztec snake god has taken the material form of an apartment complex.

The massive cave church of Cairo's Zabbaleen community is one of the largest Christian churches in the Middle East.

Breathtakingly blue walls shimmer inside the "Glacier Behind the Town."

The world's highest and most dangerous infinity pool lies at the precipice of Victoria Falls.

The beautiful baroque library of the Hapsburg empire.

A magical place that lets you play in and explore the world of Studio Ghibli.

The world's largest model of our planetary system.

On Japan's Tashirojima Island, cats are king.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

Visit a surreal landscape so otherworldly NASA actually used it to train the Apollo 17 crew.

One of the largest necropolises in the world is home to a stunning array of historic Middle Eastern tombs.

This narrow path was cut right into a French mountainside to feed the country's early naval expansion.

This strange seaside tower got its name from a wealthy eccentric who would hide coins among its stones.

The world's greatest slide descends 18 stories from this looping mountaintop viewing platform.