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

This arch granting triumphal entrance into Antalya was designed to honor the emperor's visit.

One of the most exquisite Lycian hilltop citadels in Turkey.

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

The ancient latrines of the Greeks, in all their public glory.

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

A fountain standing as a testament to a doomed alliance.

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

Roman ruins, natural methane fires and a lovely beach.

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

The best-preserved ancient theater in the world.

A sixth-century Byzantine cistern hidden below a modern carpet store.

Legend says if you stick your thumb in the hole and it gets wet, your wish will be granted.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

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

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

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

A small etching on the white marble parapet was written in runic script by a Viking mercenary.

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

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

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

A marvel of Byzantine engineering under the streets of Istanbul.

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

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