The medieval center of the Islamic world was also once the seat of Saladin's sultanate.

Unscathed for almost 2,000 years, the best preserved Roman triumphal arch is in a small southern Italian city.

The courtyard of this small Marinid madrasa is a dazzling example of intricate Islamic architecture.

The other side is actually green.

Mosaics, storks, and brothels—this ancient city has it all.

The remains of a magnificent medieval fortress that was the capital of a vast empire.

These cliff-dwellings might be Mexico's least visited archaeological site.

The only visible remains of this ancient Greek underground temple is its roof protruding from the earth.

An ancient Roman theatre restored to its former glory in the Spanish city of Cartegena.

A 2,000-year-old computer demonstrates remarkable engineering and astronomical precision.

The remarkably well-preserved final resting place of a powerful ancient Thracian king.

This complex of vertically-excavated Buddhist, Jain, and Hindu monolithic temples in India's Maharashtra providence illustrates a spirit of tolerance characteristic of ancient India.

Sparkling, calcite-covered skeletons of children who may have been sacrificed to appease an angry god.

Ancient rock-hewn town that witnessed key events of Georgian history.

This beehive tomb built for royalty sat hidden for over 3,000 years.

This seaside sanctuary was once one of the most important religious sites for women in ancient Greece.

Hideout of thieves, monks, and goat-footed gods.

These artifacts were discovered during the construction of the airport, with some dating back to the Neolithic period.

In the Middle Ages, villagers would sound this stone trumpet to boost fertility and coax fish to shore.

This large round boulder is said to emit spiritual power, but it may just be magnets.

The largest stone moai on Rapa Nui.

Step inside an ancient beehive tomb built for a mysterious cult hero.

This legendary city has been a tourist attraction for centuries.

The hallucinogenic center of the ancient world.