This crumbling medieval basilica once attracted pilgrims by the thousands to collect a miraculous dust that formed above the saint's tomb.

This half-forgotten fortress was constructed by the Ottoman conqueror of Constantinople.

A gorgeous, Gaudí-esque stairway constructed in the city of Istanbul by a prominent Jewish family.

This ancient subterranean megalopolis is known for the hot oil traps that were installed above each of its entrances.

One of the largest wooden constructions in Europe was meant to be a casino, but soon became an orphanage.

This column celebrates Rome's victory over the Goths, and may be the oldest Roman monument in Istanbul.

The alleged house of the Virgin Mary is tucked away in a park and nature preserve on Mt. Koressos in Turkey and is holy to both Catholics and Muslims alike.

The ancient abodes are a testament to human ingenuity amid harsh climates.

A charming beach town in Turkey captures all the colors of the rainbow.

Standing proud atop a Turkish bluff, this Ottoman palace has retained its grandeur despite being abandoned for centuries.

The best-preserved ancient theater in the world.

This Turkish cave boasts some rather bizarre associations with the King of Mount Olympus.

Roman ruins, natural methane fires and a lovely beach.

While not Turkey's deepest underground city, this subterranean redoubt is the largest.

Flames have been burning within this mountain for more than 2,500 years.

Live a night as a Byzantine King, with a minibar and private jacuzzi.

This famous city eluded concrete detection until the early 2000's.

A Lycian city of the dead carved into the hillside of Southern Turkey, complete with startlingly human touches.

These tombs were built into the side of a mountain so that ancient angels could reach the dead.

Morocco’s modern capital was once a haven for Barbary pirates, who went so far as to establish a republic of their own.

Exploring the wilder, more passionate sibling of Erg Chebbi feels like discovering a secret sun-kissed planet from another galaxy.

Numerous impressive carvings are embedded in the trees lining this street in Marrakech.

The oldest monument in Marrakesh and the city's only surviving example of Almoravid architecture.

Designed as a labyrinth, this subterranean prison was crafted without bars or doors.