Harry Potter once visited this massive limestone cliff, which was carved by an ancient glacial river.

A group of glacial erratic boulders are improbably balanced on white limestone pedestals.

The largest cave chamber in Britain—big enough to fit a whole cathedral inside.

A massive glacial deposit that includes a carved staircase to reach the top.

This amazing trail among the many waterfalls around Ingleton has been enchanting visitors since 1885.

This incredible viaduct was part of the Victorian railway boom and helped the Midland Railway navigate tough terrain.

A steep and winding road in the Yorkshire Dales passes by these deep natural potholes.

These legendary stone steps were once used to haul coffins up the rockface.

It's believed a local adventurer spent 50 years living inside this cave.

The highest peak in all of England is plagued by dangerously fickle climate shifts.

One of the highest Roman forts in Britain is set amid dramatic scenery on a notoriously difficult road.

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

These Roman ruins in England’s Lake District are 2,000 years old, but look pretty good for their age.

Local legends say that fairies used to dance in the moonlight here and invite handsome young men into their grottoes.

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

A circle made up of 19 boulders has stood in Scotland's Bladnoch Valley for some 4,000 years.

Dating back to the 500s, these stones include some of the oldest Christian memorials in Scotland.

The ruins of a 12th-century seaside castle on the southwest coast of Scotland.

Near this coastal cave stands a small memorial to the hermit who made it his home for three decades.

Legend says this cave housed a 16th-century cannibal and his family of 48.

Now in ruins, this castle stood for centuries and saw a number of gruesome events.

A historic cave in Scotland once served as a hiding place for a famous Covenanter.

These ancient symbols freckling a Scottish cliff remained hidden for centuries.

Modern megaliths form this work of cosmic, Celtic landscape art.