In the Scottish Highlands, this 13th-century castle ruin is hidden at the end of a farm track.

Tucked away behind the mansions of Mayfair, this picturesque garden is a hidden London treasure with a spooky past.

The largest statue of this convex, homogeneous object with just one stable and one unstable equilibrium point.

This Neolithic stone circle is the most complete of its kind in Scotland.

The main residence of the Erskine family and the hereditary keeper of the nearby royal Stirling Castle.

A diminutive, thousand-year-old church believed to be the smallest in Ireland.

A former coastal watch post has been turned into a bothy with unrivaled views of the sea and its inhabitants.

This figure of a local merchant is said to reanimate and do a dance during Hogmanay.

A striking glass tribute to two sisters who suffered during Scotland's "Killing Time."

A grave marker depicting a body snatching tableau on a 19th-century tombstone.

This pyramid is dedicated to all those who suffered martyrdom for civil and religious liberty in Scotland.

A private home envelops the ruins of this 13th-century priory.

An impressive piece of infrastructure that seems outsized when considering it serves an island with a population of less than 300.

This uniquely shaped rock formation is one of Scotland's most iconic mountains and gives spectacular views in all directions.

This collection of Neolithic monuments make up one of The U.K.'s richest archeological landscapes.

This impressive midden of scallop shells apparently all comes from a single fishing company.

A tumbling waterfall near a narrow passage that was used to herd cattle for hundreds of years.

This Neolithic-era complex boasts standing stones, a cairn, and the only henge in Western Scotland.

"The Most Wonderful Wonder that ever appeared to the Wonder of the British Nation."

Model aircraft soar over 360-degree views of the countryside at the start of England's oldest road.

This windmill is believed to be the oldest in the British Isles.

Believed to be the smallest castle in Europe.

One of the best-preserved, yet least visited stone circle sites in Cumbria.

The remains of an ancient bathhouse sit inside this aptly-named pub.