An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

A program of Communist glamour in post-Stalin Poland is preserved in this colorful museum.

The former Nazi concentration camp stands as a museum to remember this dark chapter in European history.

An impromptu shrine appeared shortly after beloved "Torchwood" character Ianto Jones was killed off the show.

Displaced highlanders would take shelter from the wet Scottish climate under the large walled bridge at Glasgow Central Station.

One of the largest megalithic complexes in England, which local legend holds is a wedding party turned to stone by the Devil.

This stately monument has been wearing a traffic cone hat for decades much to the delight of the locals.

This Italian-style temple replica has been threatening to fall off the Irish coast for hundreds of years.

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

A succession of eerily contemplative iron figures lead from a Scottish museum to the sea.

This century-old grotesque has a mysterious history and may not actually be a rabbit.

This iconic 1,000-year-old medieval castle is a favorite of the film industry, most notably as the location for Hogwarts in Harry Potter.

This short bridge is the only thing connecting a tiny Irish island to the mainland.

The heads of two giant mythological water horses honor Scotland's horselord past.

Eighty million natural history specimens call this gargantuan museum home.

Old-fashioned knowledge and modern engineering create the world's only rotating boatlift.

A metal tree emits eerie, melodic notes on top of Lancashire's Crown Point.

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

"Respectful to the dead, safe and sanitary to the living, dedicated to the Genius of Memory..."

One part local history, 99 parts gruesome haunted house.

A church that bred legends, and served as an inspiration for the Da Vinci Code.

The gloomy ruins that inspired Bram Stoker to bring Dracula to life.

Northern Ireland's Brobdingnagian stepping stones.

Famously misunderstood wonder of the ancient world