Almost nothing but earthworks remain of this long-lost castle.

The ruins of a 19th-century corn mill are haunted by a malevolent cave-dwelling spirit.

This historic castle was already in ruins by the 13th century.

Harry Potter’s Hogsmeade Station is also a charming blast from the past situated in North Yorkshire.

Hundreds of years ago, this lion-shaped door knocker could help a person accused of a crime find temporary safe haven in Durham Cathedral.

This magnificent arch is all that remains of a former smelt mill.

Only the headframes remain from this mining operation, once one of the largest in the region.

Aliens and monsters lurk inside this museum dedicated to one man's lifelong adoration of all things sci-fi.

A monument with a strange legend involving a horse's tongue.

This moss-covered boulder is said to be part of a diabolical plant to sabotage the Durham Cathedral's foundation.

A Brutalist monument in the middle of a housing estate by artist Victor Pasmore.

A vintage fire engine is hidden inside this World War I-era water tower.

The church and nearby castle are all that remains of a medieval village, mysteriously abandoned.

An abandoned Yorkshire castle that is hidden in plain sight.

These courts are the only ones of their kind in the world, made for a unique ball game that dates back to the 1700s.

The longest staircase lock in Britain.

These lamps were created to expel sewer gases after an event known as The Great Stink.

This tribute to Sunderland's mining past stands outside the home of its football club.

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

These formal gardens were designed to be admired from the vantage point of the castle.

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

It's said this was once the home of King James V's pet lion.

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

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