This narrow Ghent alleyway is an officially sanctioned street art tunnel.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

A breathtaking bridge that crosses a vast gorge over a river's torrents, and has a tale of a devil architect attached.

A gravity-defying "devil's bridge" that has a surprising architectural feature for its stability.

A 14th century bridge built as a fortress, where the devil lurks on one of its towers.

A stunning bridge that appears as if it's lunging to the shore, and has a legend of a devilish architect.

Three bridges straddle a stream, one stacked upon the other.

Picturesque ruins once held off mighty armies.

You can enjoy a (possibly haunted) stay at the medieval Norman castle that was once a favorite hunting lodge of King John.

A 200-year-old prison that now houses a peculiar crime museum.

Abandoned boats decaying in the largest ship graveyard in mainland Britain.

The highest peak in Wales is said to be the final resting place of a giant killed by King Arthur.

The 5,000-year-old megalith is believed to be Scotland's tallest standing stone.

A magnificent, iconic stone tower in the Scottish Highlands.

A whale's jawbone and a malfunctioning harpoon welcome you to the village of Bragar and its lore.

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

These haunting ruins belong to an ancient village that once had one hell of a view.

The sign announces the Scottish village's cosmic connections, as it's twinned with Glenelg, Mars.

Contrary to what its name suggests, you won't find any bunnies here.

This Welsh village gave itself a ridiculous name in a publicity stunt a century ahead of its time.

This castle was once the home of one of the most powerful women of the Renaissance.

A tiny village in Wales claims the name of a noble medieval hound slain for a crime he didn't commit.

This castle once belonged to one of the most prominent families of medieval Carrickfergus.

The site of many battles and tragedies, including the 40 maidens who leapt into the sea.