A fountain standing as a testament to a doomed alliance.

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

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.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Monastery complex at the location where bodies of the executed Romanov royal family were discovered.

Russia's own leaning tower was built on a tragic historical fable.

The oldest known university in the world is in Fez, Morocco.

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

While not Turkey's deepest underground city, this subterranean redoubt is the largest.

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

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

A seemingly simple canyon that was the backdrop to a number of famous movies.

Thousands of narrow alleyways in an ancient medieval city make up what's believed to be the world's largest car-free urban zone.

Buildings from the fictional planet of Tatooine still litter the Tunisian desert.

This ancient burial site is believed to be one of the first earthquake-protected structures in the world.

Mirrors and glass shards cover every inch of this arrestingly beautiful mosque.

Named after a legendary garden called Eram in southern Arabia, built by order of Shaddad, an Arab king who wanted to compete with Paradise.

The palace of the King of Kings, burned by Alexander the Great.

Marked by the hand of the explorer Henry Morton Stanley.

17th century mosque for Shah Abbas' harem.

Putrefaction plateaus in Iran, where the dead were sent for decontamination before going to their final resting place.