Believed to be the smallest castle in Europe.

A sea cave with a waterfall and Viking past

This ruined travelers shelter sits abandoned in a desolate bog of Flow Country.

This rare surviving broch is one of Scotland's most impressive Bronze Age structures.

Built as a training camp, this site became a detainment center for prisoners of war and German civilians during World War I.

One of the oldest suspension bridges in the world blends in perfectly with a medieval castle.

A repurposed railway tunnel with otherworldly acoustic characteristics.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

In this cobwebbed old operating theater, you can practically hear the screams of the unanesthetized patients.

A student driver's nightmare.

The Cold War remnants of a nuclear missile launch site in the Northamptonshire countryside.

This Georgian architectural masterpiece is the only cloth hall left in Britain.

This tallest folly in the world began its life as an elaborate factory chimney.

Nicknamed the 'Chestergate Hotel,' the underground tunnel had beds, lights, and even flushing toilets.

The final resting place of England's most notorious bandit.

The little-known second castle that William the Conqueror built in York.

A bench and a bridge pay tribute to Birmingham's favorite heavy metal band.

The adorable animals return to this nature reserve every fall to give birth to their pups.

Dedicated to the 4th Baronet of Sledmere.

A deserted medieval village where bodies were once mutilated to prevent them rising from the dead.

The oldest candy store in England has been selling traditional sweets since 1827.

At night, the enormous sculpture looks like a UFO hovering above the English hills.

A metal tree emits eerie, melodic notes on top of Lancashire's Crown Point.

A lavish Victorian mansion wound up inheriting a gruesome reputation that would be its demise.