This obscure walkway links Edinburgh’s Old Town with one of the city's prime vantage points.

Huge standing stones mark a site of megalithic mystery.

The ruins of a medieval monastery named after a type of tree.

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

A Neolithic passage tomb said to have sheltered two legendary Irish lovers.

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

Just another ancient, mysterious Irish stone circle.

The whiskey producer's archives includes a historical list of infractions committed by and associated penalties exacted upon employees.

A tribute to the incredible generosity the Choctaw Nation showed the Irish people during the Great Famine.

A gated cross stands on the site where an Irish revolutionary met his end.

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

Remnants of the 16th-century defensive wall still stand unassumingly within Edinburgh.

The U.K.'s first underground railway line is now a lively thoroughfare for runners and cyclists.

This once-controversial and slightly confusing statue of Achilles was built out of captured cannons.

A familiar otherworldly creature guards this 12th-century Scottish abbey.

A crumbling mountain resort that looks like it was abandoned in an instant.

An abandoned lighthouse awaits its destiny: being buried under shifting sand.

A historic holy well hidden near a charming English park.

Curious onlookers have suspected this strange structure is a secret government base.

These quaint cottages feature built-in signaling devices for fishermen.

The Scottish Reformation leader's grave was paved over and is now a parking lot.

The 16th-century church has the only stained glass windows that survived the Scottish Reformation intact.

This small museum in a 17th-century building honors three iconic Scottish writers.

The fountain marks the area where hundreds of accused witches were burned at the stake.