This open-air mosaic gallery honoring an English artist took hundreds of volunteers more than seven years to create.

The first geometric self-supporting spiral stairs in Britain are a truly beautiful sight.

Installed at a chaotic intersection, this gave London traffic cops a place to hang their heavy woolen coats.

A decommissioned tube carriage within a London museum hosts a regular pop-up supper club.

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

This small collection of rare books was uniquely locked up for safe keeping.

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

A network of concealed passageways lies within a busy London Underground station.

This once-controversial and slightly confusing statue of Achilles was built out of captured cannons.

The bronze uniforms commemorate the vital role of women during World War II.

A giant scrawl on the skyline of south London.

The home studio one of Britain's first independent record producers is also the site of a murder-suicide.

A wellspring of creativity in an already artsy East London neighborhood.

The commemorative stone column conceals a secret laboratory.

A building that survived WWII, possibly on the virtue of its name alone.

London's most popular recording studio, located in the capital's East End, runs partly on solar power and has played host to some of the world's biggest acts.

This former medical factory gives home to cutting edge arts in the shadow of a gas works.

Residential building on the Regents Canal is a breeding ground for creativity and innovation.

A tribute to all the green-thumbed workers who tend London’s public parks and gardens.

It celebrates a very stinky task and salutes London's fatberg-vanquishing team.

A living memorial to the trees London lost during the Great Storm of 1987.

An exercise in radical design and social living that became the epicenter of Soviet spy networks in London.

A faded reminder of what was once a common sight in London during the Blitz.

A marine aquarium with an astounding variety of fish hides in the basement beneath the famous Palm House.