This iconic 1,000-year-old medieval castle is a favorite of the film industry, most notably as the location for Hogwarts in Harry Potter.

Also known as "Robin Hood's tree," this tree became a famed location along Hadrian's Wall before it was cut down in an act of vandalism.

This huge concrete map of Scotland was built as a thank you gift from a Polish soldier.

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

This picturesque view of the Scottish Borders was beloved by Sir Walter Scott.

It's said that at this location, a Scottish poet met the Queen of the Fairies.

The heart of a Scottish legend had a centuries-long journey before reaching its final resting place.

This Scottish manor house is a lush relic from the life of a literary great.

The inverted pyramid design of this station stands out amid Bratislava's urban landscape.

A two thousand year old brothel uncovered in Northern Greece.

The sad remains of a monument to martial arts legend and movie star Bruce Lee—in the middle of Balkans.

One of the earliest large-scale "hyper" roofs in the U.K. is now a derelict roadside attraction.

The largest timber structure in Europe.

A million and a half tons of earth were used to create one of the world's largest land sculptures.

A kaleidoscopic warehouse-maze of handmade neon signs.

These ruins witnessed the final gathering of the failed Jacobite Rebellion.

These fantastically named natural pools look like something out of a Scottish myth.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

Ship-sized kinetic sculptural fantasy.

The Great Fire of London and the regulation of one-way streets both started in this alley.

A student driver's nightmare.

This octagonal cottage is the smallest and the oldest council house in the United Kingdom.

St. Mary's Asylum was isolated and abandoned before being converted into a Bed and Breakfast.

These giant sculptures are supported by a bizarre menagerie of feet.