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

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

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

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

This Scottish burial tomb once held hundreds of ancient eagle bones.

Fascinating town where normal life interfaces with the occult.

Famously misunderstood wonder of the ancient world

The oldest working mechanical clock in the world.

The anatomical-pathological collection of a man who changed surgery.

On October 17, 1814, a 15-ft. wave of beer ran rampant through the streets of London.

One part local history, 99 parts gruesome haunted house.

A diverse collection of wax, bone, papier-maché and mummified relics.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

The glowing blue Nymphaeum of Emperor Tiberius.

2300-year-old Roman road connecting the empire.

A fortified city, home to a remaining population of five families

World's largest film studio, where visitors tour the decaying sets that litter the harsh desert environment.

An awe-inspiring mosque in Morocco with one of the tallest minarets in the world.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

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

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

Preserved Inca city and site of the last Inca stronghold against the Spanish conquistadors.

The stones of this Incan wall complex fit together so well you couldn't fit a piece of paper between some of them.

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