Created hundreds of years ago, the magical follies and landscapes at this park were almost lost to time before being restored.

The sculpture is made of more than 100,000 knives collected to raise awareness about violence.

A collection of retro plastic goods made with "the material of a thousand uses."

This ancient bridge made of stone slabs is said to be reserved for the devil to sunbathe.

This abandoned lock-up was saved because of its connection to a local football team.

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

The first tunnel to be dug beneath a river, repurposed as an art and museum space.

A Victorian park cemetery, standing on the site of what was once the Great North Wood.

Collection dedicated to brands, packaging and advertising.

The Metropolitan Police refurbished the blue box (perhaps not coincidentally) the same year "Doctor Who" returned to TV screens.

A naturally mummified 2,000-year-old man.

A historic arboretum and non-conformist, non-denominational park cemetery.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

The sixth of London's "Magnificent Seven" cemeteries, and a source of unlikely inspiration to Beatrix Potter.

One of the world's largest collections of pathological specimens.

The remains of Crystal Palace Great Exhibition of 1851.

The final resting place to 300 Victorian-era pets hides inside the city park.

An incarceration museum on the spot of possibly the oldest prison in England.

A historic London cemetery now serves as a nature park incorporating gravestones & memorial statues.

The world's first underground farm is in a World War II bomb shelter beneath the streets of London.

In this cobwebbed old operating theater, you can practically hear the screams of the unanesthetized patients.

A vast overgrown cemetery, once known as one of London's "Magnificent Seven."

One part local history, 99 parts gruesome haunted house.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.