This ornate mosque is said to hold the remains of Muhammad's granddaughter beneath its dome of pure gold.

Mysterious lost empire of the Silk Road.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

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

What is left of the pillar of Saint Simeon, the voluntary martyr who climbed the column to give his sermons, remaining perched there for thirty-seven years.