This Norman castle has been the scene of assassination plots, religious persecution, and Nazi conspiracies throughout its long history.

An abandoned, desolate train tunnel that was used during World War II.

Nestled atop a wind-swept crag in the Scottish Highlands is a lonely memorial to a beloved hiker.

A carved bench marks the Scottish cave that inspired the classic adventure novel "Treasure Island."

A dramatic sculpture high up in Yorkshire with vistas on an industrial scale.

"The Donut" was built as part of an expensive, ill-fated engineering endeavor.

Centuries of human activity have forged an eerie landscape of ruins and craters on an exposed and windswept hilltop.

The remains of the wrecked steam trawler can be found on the beach at low tide.

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

This landmark Victorian folly rewards visitors with spectacular views over the Peak District.

These picturesque ruins crumble beautifully into the ocean.

It's a mystery how these curious columns wound up in an Edinburgh suburb.

On a remote island, legend has it that a fiddler and his wife were turned to stone.

Legend says this little-known stone circle is formed from people petrified as punishment for dancing on the Sabbath.

A cross marks the spot in a small Scottish village that claims to be the exact center of the country.

A modest stone circle in North Wales.

It's believed King John of England stayed at this 13th-century castle before riding off to sign the Magna Carta.

From here, the loch appears to take the shape of mainland Scotland.

This stretch of the River Severn where large waves flow against the current is the birthplace of river surfing.

The farthest northwesterly point of the British mainland is one of the most remote places in the Scottish Highlands.

The wreckage of an old coastal trading vessel is only visible at low tide.

The National Railway Museum in York is the largest railway museum in the world, attracting almost 1 million visitors per year.

This centuries-old hotel hides a network of secret cellars and passages once used by smugglers.

Legends say that this small island was the final resting place of the Welsh saint of lovers.