This abandoned fort is said to be the most haunted place in India, so much so that entry is prohibited after sunset.

A once-stately trading fort is now a ruin slowly being consumed by the sea.

This Sri Lankan cemetery is the final resting place of sci-fi legend Sir Arthur C. Clarke.

The ruins of this old church are slowing sinking into the sand.

If you want to take a peek at Area 51, this is legally as close as you're going to get.

Mysterious meeting place for UFO hunters near Area 51.

A mostly desolate bar on a remote island hosts hundreds of sailors for a few days each year.

Nearly 40 miles and 1,000 years of limestone mines under Denmark.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

These Nubian pyramids are strange and unique, even by pyramid standards.

A flooded Mexican cave that hides a river beneath the water.

An ancient city exhumed from the depths of the ocean.

Even King Tut was intrigued by the glass of the Great Sand Sea.

An ancient capital city that dates back 3,000 years old and harbors many surprises.

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

Famously misunderstood wonder of the ancient world

The Arctic Archipelago is home to world's largest third order island: an island in a lake on an island in a lake on an island.

A five-square-mile slice of Spain on the Mediterranean coast of North Africa.

A clear blue swimming hole with hidden caves, still unexplored.

The oldest (maybe) swimming pool in Iceland is a stunning oasis built into the side of a lush hill.

This geothermal hot spring hides beneath a slowly growing mineral dome.

The world is full of swimming holes, but few compare to Samoa’s idyllic To Sua ocean trench.

From dragonfruit to mangoes to durian this Thailand resort allows guests to stay inside all manner of giant fruit.

This Russian religious complex is a Frankenstein's chapel that includes influence from almost all the major faiths.