This artificial archipelago was supposed to resemble a map of the world.

A preposterously luxurious hotel with gold-plated iPads, Rolls Royce chauffeurs, and a staff that trains by watching "Downton Abbey."

This futuristic building is yet another architectural wonder in Dubai.

The medieval center of the Islamic world was also once the seat of Saladin's sultanate.

An ancient instrument used to measure the waters of the Nile so Egyptian farmers would know whether to expect famine or flood.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

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

A marvel of Byzantine engineering under the streets of Istanbul.

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

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

Pompeii's less famous neighbor is still revealing her secrets.

Skulls from the plague of 1656 and World War II bombings are united by a cult dedicated to caring for the ancient dead.