The ruins of this gorgeous clifftop castle look like something from a fantasy novel.

Islanders once used this dramatic, otherworldly landscape to hide their cattle from Viking raiders.

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

This castle was established by the 4th Duke of Montrose and is connected to the Buchanan Clan.

An ancient Scottish rock formation said to be the gravesite of a giant remains ensconced in legend and intrigue.

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

Spend the night in this formerly abandoned traditional Scottish village.

A strange rock with a sinister reputation lurks within the crimson waters of this Scottish glen.

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

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

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

Just a few miles off the western coast of Ireland lies an isle steeped in Irish literary history.

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

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

An 1814 castle that hosts an exhibit of "explorabilia".

A spectacular hidden beach in Ireland has the dark, disturbing nickname of "Murder Hole Beach."

There might not be much left of these Irish ruins, but their linguistic legacy is still going strong.

Experience what life was like in Ireland during the Viking and medieval ages.

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

A rocky Irish outcropping with a history of wealth, conflict, and ruin.

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

A corkscrew-shaped barn in Ireland.

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