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.

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.

After nearly 60 years, there's still a bear at Paddington Station looking for help.

Eighty million natural history specimens call this gargantuan museum home.

Inside this 11th-century church, a medieval-style tomb of the World War I hero known as "Lawrence of Arabia."

The world's oldest operational public pier railway has shuttled seagoing commuters from ship to shore since 1909.

A stone, covered in metal, commemorating an event that happened somewhere else a thousand years ago.

Want to properly offend a king? Sculpt a giant hill figure in chalk of him riding out of town.

Before 1993, this historic-looking village—King Charles III's pet project—didn’t exist at all.