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

This 1920s Dutch barge is now a floating bookstore.

The decaying ruins of Wales' first asylum for the mentally ill.

A turn-of-the-century prophecy comes true when a mischievous wooden Devil watches the neighboring church burn to the ground

This ancient abbey now lies in majestic ruin behind a caravan park.

A memorial to the British politician who spearheaded the National Health Service.

The painting on an aptly named street honors the 1980s slasher movie.

This ancient castle has been abandoned since the Edwardian conquest of Wales.

Go deep down into the earth to experience the world of Welsh coal miners.

One of the few surviving street funiculars in the world.

The world’s only museum dedicated to baked beans.

After years of slow decline, a derelict Gothic castle is now being restored to life.

Picturesque ruins once held off mighty armies.

The world's largest prehistoric copper mine had 30,000 animal bones scattered throughout the maze of passageways.

These haunting ruins belong to an ancient village that once had one hell of a view.

High Victorian fantasy created a fairytale castle out of a ruined fortress in Wales.

At the United Kingdom's only residential library you can sleep among the books.

Three bridges straddle a stream, one stacked upon the other.

This well-preserved Cistercian Abbey in a romantic pastoral setting has inspired artists like the poet Wordsworth.

This abandoned asylum in Wales might look haunted, but it's still beautiful.

A subterranean playground in an abandoned slate mine.

The enormous earthwork sculpture honors the ponies that lived and worked in the old colliery.

This “living museum” at UCLA exhibits thousands of plant species from all over the world.

A museum collection honoring the long history of the FDNY is held in a disused Manhattan fire house.