Ancient cliffs resembling a kilt on Scotland's second largest island emit an entrancing sound.

The fountain marks the area where hundreds of accused witches were burned at the stake.

Amazing and mysterious Neolithic settlement on Scotland's Orkney Islands.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

These fantastically named natural pools look like something out of a Scottish myth.

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

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

The highest dunes in California are the most likely place in the area to hear the Singing Sands.

In the middle of an extremely unforgiving and desolate high desert is the most secret military facility in the world.

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

A gothic palace of endless stalagmites and pseudoscorpions waits within one of the world's most beautiful caves.

Mysterious meeting place for UFO hunters near Area 51.

This central Nevada cave is the spiritual home of ancient and enigmatic pictographs.