An archive of ceramic eggs painted to record clowns' personal makeup designs.

The oldest Jewish cemetery in Southeast Asia is a monument to a disappearing community.

The world’s largest magazine collection was born from a single shelf in a teen’s bedroom.

A 17th-century church is nestled within the walls of a 15th-century ruin.

This museum tucked below a charming cafe gives a brief snapshot of photographic history.

There's an exclusive Beefeaters pub hidden in the Tower of London.

An unsanctioned shrine that sprung up outside the late singer's home is causing a stir in London's Highgate neighborhood.

The canine-themed book collection claims to be Europe's largest dog library.

The world's oldest optical museum is an odd collection where the exhibits look at you.

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

The ruins of a megalithic monument sit right in the garden of a luxurious Maltese resort.

The collection contains over 25,000 items and details the painful dental practices of the past.

Three small rooms at the back of the “official” church of London's clowns.

An existential riddle in the world's largest ancient castle.

This hidden green space is the city's second largest conservatory.

This doorless 20th-century elevator doesn't stop or slow down.

London's only public statue of the much-married monarch adorns the gate to St Bartholomew’s Hospital.

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

There was a top secret plan during World War II to seal a group of soldiers inside the rock.

A Jenga-style cylindrical tower of books that appears to go on forever.

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

A kaleidoscopic warehouse-maze of handmade neon signs.

An eccentric 18th century naval officer built a ship's quarterdeck on his roof, the inspiration for Mary Poppins's "Admiral Boom."

Hang out with thousands of butterflies in one of the world's largest such enclosures.