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

The oldest continual pilgrimage site in Britain was supposedly created by a gruesome beheading.

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

The stately remains of Llywelyn the Great's mighty fortress.

Three bridges straddle a stream, one stacked upon the other.

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

The highest peak in Northern Ireland is topped with a stone tower and haunting burial mounds.

The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

The atmospheric road was never meant to be so creepy.

This 14th century tower house was once the home of Irish poet W.B. Yeats.

An ancient holy well said to be used by the patron saint of sailors and travelers, lost in the boggy west of Valentia Island.

You can see three Irish counties from this Neolithic hillside fort, once the seat of the Kingdom of Ailech.

Just another ancient, mysterious Irish stone circle.

Achill's most recently abandoned village dates back to to the Age of Enlightenment.

The ruins of an 800-year-old monastery boasts the tallest round tower in Ireland.

A hugely vast Irish landscape of barren rock that stretches for miles.

This 30-foot pile of rocks may be the grave of a mythological Irish queen.

This single room has survived the centuries with almost no deterioration.

Behemoth, cannon-like telescope operated by generations of Irish earls.

Local legend says the remains of Father Christmas lie within the medieval grounds.

While only two of the ancient buildings at this site are actually churches this was one of the earliest Irish pilgrimage sites ever.

An Iron Age fort on the edge of a seaside cliff offers a glimpse into an ancient, mystical world.

The world's toughest modern Christian pilgrimage leads directly to the gates of Hell.

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