This ancient Irish religious site is covered in ancient carvings, many of which have barely aged.

One of the most popular megalithic sites in Ireland stands as a humbler version of Stonehenge.

An unusual manor of stunning beauty, born out of a crippling disease.

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

Perfectly preserved ancient monastery in an impossibly dramatic location on a rocky island in the Atlantic.

Nightmarish example of the unintended consequences of weapons testing.

Site of the 1889 murder-suicide of crown prince Rudolf and his lover Mary Vetsera.

A beautiful, dense forest in the shadow of Mount Fuji, with a tragic reputation.

Birthplace of the Tendai sect and home to the marathon monks.

A Belgian self-built tower inspired by the Bible and ancient civilizations.

Site of the largest impact event to occur over land in Earth's recorded history.

This attraction was abandoned after the Chernobyl disaster.

The deepest hole drilled in the name of science, where evidence of Precambrian life was found.

This Scottish bridge seems to compel dogs to leap to their death.

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

The patron saint of spinsters grasps a container of dried blood.

This solitary monastery may hold the remains of Vlad the Impaler (but probably not).

A Manhattan Episcopal church with an eerie underground crypt.

This complex of vertically-excavated Buddhist, Jain, and Hindu monolithic temples in India's Maharashtra providence illustrates a spirit of tolerance characteristic of ancient India.

The footprint of a frustrated devil in Munich's Cathedral.

Virgil's many-mouthed gateway to the underworld.

Erotic art covers the walls of the largest ancient pleasure palace.

Ancient snack bar of the Roman Empire re-opened.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.