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.

Thanks to both terrific preservation and historic vandalism this ancient site is known as the "Heart of Neolithic Orkney."

Possibly the oldest of Britain's ancient henges is also one of its most stark.

This mystical orb covered in strange symbols is thought to have been used in ancient Greek magical rituals.

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

The most visited, and possibly most controversial, museum in Germany.

This 15th-century island fortress later served as home to the executioners no one wanted to live near.

150 or so scrounged-up lamps, chandeliers, and lanterns light up this alley in central Athens.

The highest peak in the United Kingdom has a history of physics, specters, and a pilgrimage of strange objects.

A cross marks the spot in a small Scottish village that claims to be the exact center of the country.

This tiny island featuring 9th-century Viking ruins is only accessible at low tide.

The true age of this ancient stone circle is unknown, but its stunning vista isn't in question.

Cretean quarry suggests real-life site for ancient Greek myth of the man-eating Minotaur in his labyrinth.

This legendary city has been a tourist attraction for centuries.

Old-fashioned knowledge and modern engineering create the world's only rotating boatlift.

Enter the world under the hill at this ancient UK burial chamber.

Climb inside an iron crystal magnified 165 billion times its normal size.

This gem is often wrongly overshadowed by the larger, newer Metropolis church in Athens.

Catacombs turned marketplace.

This famous archeological mystery may be an ancient example of movable type.

A Bronze age settlement on the Greek island of Santorini might have been the inspiration for Plato's Atlantis.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.