A little-known caravanserai hidden among farmhouses in the Turkish countryside.

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

A deadly ancient portal to the underworld.

Roman ruins top white travertine terraces formed by ancient hot springs.

An underground network of massive stone arches and their skylit vaults support ruins of portico structures above.

This 11th-century Greek monastery has renowned mosaics and relics of a brutal past.

Taking the subway here means doing so over a bridge located in the middle of an estuary.

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

Climb a steep hill in 90 seconds on the second-oldest urban subway in the world.

An Art Nouveau gem hides beneath the layers of city grime obscuring this once-magnificent building.

This museum was invented in a novel before being made real by the author.

A Turkish ghost town abandoned in a population exchange with Greece.

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

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

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

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.

Seven early Christians were sealed into a cave where legend has it they slept unharmed for centuries.

Carvings in Turkey's Marble Road may have directed ancient Romans to a hidden brothel.

A mysterious ancient cemetery with Roman sarcophagi and Lycian inscriptions.

Hidden just under the waters around this Turkish island are the ruins of a once great city.

This church houses the tomb—but not the remains—of St. Nicholas, the likely progenitor to Santa Claus.

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

Roman ruins, natural methane fires and a lovely beach.

The best-preserved ancient theater in the world.