A narrow, serpentine spit of sand is constantly eroded and rebuilt by competing currents.

A 19th-century relic of timekeeping.

Despite many attempts to finish this overpass, it has been abandoned since the 1970s.

Formerly known as the Malay Quarter, Bo Kaap is a colorfully-painted suburb located in the “Mother City” of South Africa.

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.

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.

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

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

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

A marvel of Byzantine engineering under the streets of Istanbul.

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

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

One of the most exquisite Lycian hilltop citadels in Turkey.

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

The best-preserved ancient theater in the world.

The largest Neolithic ruins in the world hide a notably clean prehistoric metropolis.

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

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

Alien rock formations grown from the sands of an Australian national park.

The Victoria-era quarantine station for Sydney.

Native Australian lizards inhabit this garden celebrating Sydney and its sister city in China.

One of the world's largest tractors was built to replace camel caravans.