These otherworldly formations were shaped over millions of years by the forces of nature.

The world’s largest LED display, built over an F1 race circuit.

This living legend of maritime history is enjoying a second life.

The cluster of igloo-like domes forms the remains of an ancient burial ground.

The world's largest frame offers spectacular views of the city's past and present.

On any given day this sprawling market houses literally tons of government-regulated gold, gems, and precious metals.

An abandoned desert hamlet swallowed up by sand.

This mysterious abandoned fort looks like something pulled right from Arabian legend.

The United Arab Emirates's biggest and oldest fort pays homage to a lost era.

The untimely death of a dignitary's daughter led to this fort being abandoned before it was ever finished.

Tucked between a side street and a theater, this arch once led to a prestigious riding school, and now opens to a courtyard and community garden.

The oldest surviving mosque in the UAE has mysterious origins and unusual architecture.

Planned as the world’s first zero-carbon city, it had lofty ideals—but is only 5 percent completed and aiming for 50 percent carbon-neutral.

A commemorative plaque at the door pays tribute to an "American Patriot" known for his betrayal.

An eccentric Victorian aristocrat's enormous collection of medieval armor and weapons from around the world.

A plaque marks the underground site of one of London's "lost rivers."

This five-star hotel was originally a swanky parking garage.

It is still illegal to "quarrel" at this unlikely urban oasis built on top of an electrical substation.

The townhouse where the English poet created some of his most influential work has been preserved in tribute.

The next-door homes of two very different musicians, George Frideric Handel and Jimi Hendrix.

The lab where the scientist made his groundbreaking discoveries is preserved on the basement floor of the Faraday Museum.

Tucked away behind the mansions of Mayfair, this picturesque garden is a hidden London treasure with a spooky past.

This museum inside a museum tells the story of London's timepieces.

This pub was 238 years old when it decided to revamp its image: It started serving Thai food.