During the Soviet era, the spire of this longstanding church was used as a radio transmission tower.

Walk along the medieval fortifications that have been protecting Tallinn since the 14th century.

Estonia's largest creative city is a vibrant bohemian hub located within a former industrial complex.

An empty relic of the Moscow Olympics crumbles away in Estonia's capital.

This park built on a former fortress has a reputation for romance.

Knoxville’s architectural icon was the symbol of the 1982 World’s Fair, even catching the googly eye of Bart Simpson.

One of the newest mosques in a city filled with thousands.

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

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

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

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

This former Imperial summer home was the venue for a royal slap that once echoed 'round the world.

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

No one is sure if the world's fourth-largest diamond had been found in a rubbish heap or was pawned by Napoleon's mom.

Ancient serpentine sacrifice holder that has stood the test of time.

This crucial gathering spot along the "hippie trail" still displays old notes between traveling beatniks and backpackers.

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

The best-preserved ancient theater in the world.

1513 Turkish world map, full of European state secrets and snarky commentary.

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.