An important pilgrimage site for pagans and early Christians, named for a Celtic goddess-turned-saint.

Amazing and mysterious Neolithic settlement on Scotland's Orkney Islands.

A pagan tradition of draping trees with rags eerily lives on.

Catholics make up 84% of Ireland's population but this Dublin museum remembers the small but important Jewish community.

Just another ancient, mysterious Irish stone circle.

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

Amidst the bustling streets of Dublin, there is a hushed garden that is dedicated to "All those who gave their lives in the cause of Irish Freedom."

Once the longest bridge in Ireland, this rusting span sits abandoned and overrun by nature.

An Irish cemetery filled with victims of political strife and violent conflict, including the grave of Bobby Sands.

Catacombs turned marketplace.

These fantastically named natural pools look like something out of a Scottish myth.

After being destroyed by IRA sympathizers, the ruins of this stately Irish manor have sat vacant for decades.

An eccentric garden of sculptures crafted in India decorate an Irish green space dedicated to Alan Turing.

A 18th century graveyard and its astonishing cortege of macabre iconography.

This series of Scottish caves has no clear purpose other than baffling historians.

Tiny effigies of the victims of Edinburgh's famous Anatomy Murders.

360° views of the city plus five floors of optical illusions and hands-on science.

The elaborate clockwork contraptions in this Scottish gallery create small worlds of whimsy and horror.

Wallabies live naturally on this Irish island.

A plaque hangs near the execution place of the Scottish Independence leader famously depicted in "Braveheart."

A hidden treasure in London with a rich medieval history, and the resting place of many luminaries.

The final resting place to 300 Victorian-era pets hides inside the city park.

Eighty million natural history specimens call this gargantuan museum home.

A historic London cemetery now serves as a nature park incorporating gravestones & memorial statues.