No building in the world leans as far as the so-called “Leaning Tower of Abu Dhabi.”

This former Portuguese defensive fort atop a hill was occupied for thousands of years.

Abandoned station along an ancient pilgrimage route.

Lived-in building, bedecked with an astonishing array of mirror mosaics.

Kuwait City's uniquely designed water towers look straight out of a retro sci-fi cityscape.

The surviving pieces of an ancient aqueduct that may have fed into the lost Hanging Gardens of Babylon.

An ancient sanctuary that has long been a holy site for the Chaldean Christian Church.

This beautiful arched gate is all that remains of the fortress the ancient mountaintop town of Amadiya once was.

The sacred shrine of the Yazidis.

The legendary fortress of a female Kurdish warrior leader.

At the heart of an otherwise bustling city lies some oddly abandoned and ignored historical ruins.

An ancient fortified mound raised over the millennia from settlements built one on top of the other.

A bloody history is captured in this former prison turned museum.

A monument at Alicante Marina honors a little-known hero of the Spanish Civil War.

The world's most elegant power lines.

A custom shop making factory that produces models for collectors and movies.

A comprehensive museum dedicated to Africa's oldest modern republic.

Balanced on four stone pillars, this historic tower was the site of a tragic political assassination.

Mysterious lost empire of the Silk Road.

One of the oldest and largest castles in the world.

Amid the rubble of Aleppo's Old Quarter, part of a historic market has been restored and re-opened.

Only a handful of these gorgeous historic waterwheels remain but even those are in danger from local unrest.

This little Greek plateau is home to thousands of rustic, white-sailed windmills.

According to myth, Zeus himself was hidden in this cave to escape being eaten by his dad.