A Buddhist temple covered in intricate designs and carvings made out of seashells and pieces of coral.

A rare pod of derelict midcentury Futuro and Venturo houses lines a semi-abandoned beachfront resort outside Taipei.

One of the most easily accessible examples of the rare 1960s UFO houses.

A golden egg-shaped sauna in the Arctic tundra.

According to Greek mythology, this natural spring is the home of a freshwater nymph.

Iceland's tribute to its thankless civil servants.

A bit of retro transportation flair preserved in the world's largest department store.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

Hidden in plain sight on a pair of Manhattan subway tunnels are a pair of public instruments that sing to each other.

One of the few remaining examples of 19th-century London’s attempt to clean up its reputation.

The wooden telephone box hidden away in London's Piccadilly was the original prototype of the iconic kiosk.

A memorial to a dog that inspired rioting in the streets of London.

You'd never know the houses at 23-24 Leinster Gardens were fakes—until you see the train tracks on the other side.

The majority of the museum's large collection is held in a storage space open to the public a few times a year.

The secret wartime bunker built on the platforms of an abandoned Tube station.

The sculpture of the deceased cockatoo flops atop its personal plinth.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

A wonderfully eclectic Victorian aquarium lies in the basement of the Horniman Museum.

The last four extravagant street signs of London's historic banking street.

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

Tombstones and enigmatic inscriptions hide within a vault beneath a popular London arts venue.

This overlooked street light once served as a KGB dead letter box.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

Never actually a tree at all, this spot was the site of London's public hangings for nearly 600 years.