This neolithic stone grave has been altered and restored so often its now more neo than lithic.

Picturesque ruins once held off mighty armies.

This Welsh village gave itself a ridiculous name in a publicity stunt a century ahead of its time.

One family's environment-friendly hobbit-house in Wales.

A harem-inspired Moorish fantasy design in a Victorian-era Welsh castle.

The highest peak in Wales is said to be the final resting place of a giant killed by King Arthur.

A hidden tunnel leads to an abandoned slate quarry that's now a secret swimming spot guarded by cliffs.

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

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

Scores of wax baby figurines add an unusual mood to this beautiful church on the Greek coast.

This beehive tomb built for royalty sat hidden for over 3,000 years.

These ruins of a sacred Ancient Greek temple stand next to a luxurious modern resort.

A little-known park with unusual, half-ruined structures and a mystical energy.

The Greek island's old British cemetery feels like a forgotten garden.

A sprawling collection of books and manuscripts about ancient Greece that would have put their famed libraries to shame.

This little-known, 35,000-specimen collection in Greece is a lepidopterist's dream.

Large collection from the 3rd millennium BCE.

Seventeen oak trees sprout from the roof and walls of this tiny chapel without any visual evidence of roots.

Cave on extinct volcano, once home to famous mathematician Pythagoras.

Replicas of Apollo's leonine stone guard cats still line a sacred row in Greece.

Hideout of thieves, monks, and goat-footed gods.

Fulham F.C. imploded once everyone excised its giant, hated tribute to the King of Pop.

Final resting place of John Middleton "The Childe of Hale."

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