This former Welsh metal factory is now a lovely abandoned relic but was once one of the industry's world leaders.

Thanks to both terrific preservation and historic vandalism this ancient site is known as the "Heart of Neolithic Orkney."

Once the longest bridge in Ireland, this rusting span sits abandoned and overrun by nature.

A quartet of rusting satellite goliaths are all that remain of a communication network that protected Britain from German and Russian air strikes.

After being destroyed by IRA sympathizers, the ruins of this stately Irish manor have sat vacant for decades.

The first privately owned air raid shelter in Britain, built after a horrifying night of Zeppelin bombings.

This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

The oldest inn in England served brew to the crusaders.

The largest oak in England is said to have been the hideout of Robin Hood and his Merry Men.

The remains of this deep, dark mine have left behind a haunting rocky warren of tunnels.

This tiny little pool is said to be home to a malicious mermaid named Jenny Greenteeth.

This crumbling folly looks like an enchanted left over from Middle Earth.

This haunting stone chasm is a hotbed of mossy rock and English legend.

6000-year-old site covered in more than 50 megaliths.

This beautiful "lagoon" is actually a toxic soup filled with cars, carcasses, and trash. When warnings couldn't stop people from going for a dip, the town dyed it black.

A brick foundation and piles of listing building materials are all that remains of this World War II POW camp.

The longest and tallest aqueduct in Britain can actually be sailed across.

80 years of the Battle of Peasholm on a small English lake.

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

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.

A museum devoted to the science of color.

An ancient neolithic tomb that only sees the sun twice a year.

The remains of a grand castle that may have inspired Bram Stoker's Dracula.

Pyramid shaped monument with a tall tale attached.