Colorful lights and mirror-like brine pools create trippy illusions within the historic mine.

These crumbling Nazi artillery bunkers are now fair game for massive graffiti projects.

An abandoned Yorkshire castle that is hidden in plain sight.

Rare remnants of the brick-domed ovens birthed in the Durham coalfield during the Industrial Revolution.

Only the headframes remain from this mining operation, once one of the largest in the region.

Ornamented with "Bristol Diamonds," this exotic shell grotto is considered to be the finest surviving example from the eighteenth century.

The remains of a 70-year-old military aircraft crash landing still sit on this Scottish hillside.

The ruins of this magnificent Scottish castle blend both Gothic and Renaissance architectural styles.

This magical grotto is adorned with a complex pattern of native seashells, minerals, and fragments of colored glass.

The rusting remnants of a flying boat lie scattered near the site of its fatal crash.

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

One of the largest mechanical models of the solar system in the world.

The wreck of a B-29 Superfortress now stands as a memorial left in the moors.

This surreal art house looks like a geometric version of a small chapel.

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

After mysteriously refusing to surrender at the end of World War II this sunken submarine was only salvaged in a search for Nazi gold.

Museum celebrating the history of computers, especially their role in codebreaking.

This chain of artificial lakes was an ideal test ground for the aircraft that would carry the "bouncing bombs" used by the WWII "Dambusters" squad.

The remains of the wrecked steam trawler can be found on the beach at low tide.

This Shetland Islands bus shelter may be small, but it squeezes in a couch, a desk, some art, and even an old telly.

These medieval tunnels provided water to the city above through centuries of civil war and plague.

This abandoned oil depot produces world's longest echo in a manmade structure.

The abandoned fishing village was swept right into the sea.

A miniature Italianate fantasy village on the coast of Wales and the set of ITC classic "The Prisoner."