Ruins of the Crusaders' headquarters.

Mysterious lost empire of the Silk Road.

The world's oldest map of the holy land gives us a fragmented glimpse of the layout of biblical nations.

A bathhouse from the second Islamic Caliphate decorated with frescoes of constellations, pleasure gardens, and naked ladies.

Gladiators battle and chariots race daily in the ruins of a once-great Roman city.

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

Marked by the hand of the explorer Henry Morton Stanley.

A historic trade hub teeming with gorgeous architecture, colorful goods, and vibrant designs.

The tower in this 1,000-year-old mud-brick village seems to vibrate for no apparent reason.

A dreamy mausoleum honors Persia's most famous poet.

These little castles each held thousands of pigeons.

17th century mosque for Shah Abbas' harem.

The ancient necropolis houses the immense rock-cut tombs of four Persian kings.

Ancient structures used to make and preserve ice in the deserts of Persia.

The palace of the King of Kings, burned by Alexander the Great.

Mirrors and glass shards cover every inch of this arrestingly beautiful mosque.

This memorial to World War II's fallen airmen shows us the movements of the stars that once guided them.

The world’s first museum dedicated to the history of childhood opened in Edinburgh in 1955.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

A theatre built to house the rowdy Oxford graduation ceremonies became the stage for a debate about God's existence.

The world's largest grapevine has produced a delicious harvest at Hampton Court Palace for almost 250 years.

A six-ton wedding present for the King of the Scots.

The mysterious megaliths have enchanted and intrigued visitors for thousands of years.

A medieval replica of King Arthur's legendary table, the Round Table hanging in Winchester Castle was decorated by Henry VIII.