Discover what the relics of an oasis reveal about the fall of the civilization that built Petra.

See how the majestic stadium looked 1,900 years ago.

The arena where gladiators trained, and how they made their grand entrance into the Colosseum.

Despite being in a Hindu country, the Taj features a great deal of Muslim symbolism.

See inside the famous Indian monument as never before.

Travel deep into the chambers of the Egyptian mega-temple to find a hidden city and uncover its mummies.

The truth behind Karnak's hypostyle wall, where Ramses II covered up the work of his father, Seti I.

Each warrior in Emperor Qin Shi Huang's Terracotta Army is unique. Here's an inside look at how the army was built.

Archaeologists believe the body of China’s first emperor, Qin Shi Huang, lies in a mysterious underground burial complex.

More than 170 skeletons are buried under Machu Picchu -- what do their deformities say about the mysterious city?

The ancient Incan civilization used quipus, or knotted cords, to keep records.

Witness the grandeur of Stirling Castle and learn about the unexpected guests buried just below it.

Scotland's Stirling Castle is linked to the adventures of two larger-than-life heroes.

Tour the most famous prehistoric monument in the world, and discover the graves that lie below.

A 600-year-old French manuscript reveals clues tying King Arthur to Stirling Castle.

Clues reveal what the Sphinx Temple looked like more than 4,000 years ago, and its secret ties to the yearly equinoxes.

The elaborate defenses of Egyptian tombs - and how clever thieves got around them.

Tour the most famous prehistoric monument in the world, and discover the graves that lie below.

See inside the secret tomb beneath the Pyramid of the Feathered Serpent.

The first Great Wall was built from mud and reeds over 2,000 years ago. As warfare developed, the wall had to be improved and strengthened.

Witness the grandeur of Stirling Castle and learn about the unexpected guests buried just below it.

Restoration jobs are supposed to help fix a building, but a few hundred iron clamps did the opposite on one of the world's most well known buildings. The marble is now detaching and breaking.

Treasures provide clues about the mysterious rulers of Teotihuacan.

The Pyramid of the Feathered Serpent Hides a Dark Secret: 260 Human Sacrifices.

A complex ramp was used to move the enormous marble blocks up to the Acropolis. Some of the largest blocks weigh over 10 tons.

A 600-year-old French manuscript reveals clues tying King Arthur to Stirling Castle.

Cologne Cathedral, Germany's most visited landmark, attracts an average of 20,000 people a day. Construction of the building started in 1248, but was stopped in 1473, leaving it unfinished until work restarted in the 19th century.

Scotland's Stirling Castle is linked to the adventures of two larger-than-life heroes.

The Shrine of Three kings inside the church is believed to hold the remains of the Three Wise Men, whose relics were acquired during the conquest of Milan in 1164. It's only one of many stunning features within the cathedral.

More than 170 skeletons are buried under Machu Picchu -- what do their deformities say about the mysterious city?

The ancient Incan civilization used quipus, or knotted cords, to keep records.

When parliament commissioned this clock in 1854, they insisted Big Ben be the biggest, most powerful clock in the world. It takes an hour and a half to wind this massive engineering marvel!