A sacred well steeped in Pagan roots on the West Coast of Ireland.

Human-made caves excavated to hide a secret society of wealthy pagans.

A museum dedicated to exhibiting remarkable outsider art.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

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

The ancient tomb acts as a calendar that keeps perfect time.

Northern Ireland's Brobdingnagian stepping stones.

A 30-acre garden inspired by the principles of modern physics.

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

Ancient Egyptian wigs, South American feather headdresses, a bounty of anthropological artifacts in Oxford.

The granddaddy of English geoglyphs dates back to the late Bronze Age.

Giant naked man on a hillside.

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

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

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

A grotto-like lodge decorated with gilded mosaics, rocks and a noisy waterfall was the setting for the most sumptuous pleasure house of 1900s Europe.

France's most famous cemetery, with some of its most curious tombs.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

London's largest outsider art museum.

This wildly-tiled artist's palace is a living and growing account of the creator's life, loves, and labors.

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

This legendary stone is of unknown origin, and throughout history has been a literal touchstone for British leaders.

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.