Britain’s highest medieval monastery is a remote ruin nestled at the head of a valley 1,240 feet above the sea.

A repurposed railway tunnel with otherworldly acoustic characteristics.

Abandoned for over 20 years, this art deco seaside swimming pool is a magnificent waste.

Drink your espresso at a Victorian-era urinal in this underground-restroom-turned-coffee-bar.

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

This historic London residence was once the womb of Scientology.

Where Aleister Crowley attempted to seize the Hermetic Order of the Golden Dawn in a mask and a kilt.

High-end antique collection housed in a centuries-old church.

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

William Blake claimed to have painted this gothic masterpiece after encountering this nightmarish being in a vision.

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

London's largest outsider art museum.

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

This 1920s Dutch barge is now a floating bookstore.

This small museum in a former church crypt contains artifacts of the Elephant Man, Jack the Ripper and Florence Nightingale.

Hidden behind a wall for decades, this masonic lodge was only rediscovered during renovations.

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

The anatomical-pathological collection of a man who changed surgery.

The signs of a long buried road can still be found hidden beneath a London sewer grate.

Catacombs turned marketplace.

Rebuilt remains of a temple to Roman god Mithras.

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

A tongue-in-cheek arcade where the games are based on everyday life.

A mysterious artist-run cabinet of curiosities and library.