The last occupied troglodyte dwellings in England weren't abandoned until the 1960s.

A verdant 17th-century-style garden hidden along Edinburgh’s Royal Mile.

This unique bridge curls up like a caterpillar to let boats pass and then unfurls again to span a small canal.

Overlooked by many, the two famous Scottish warriors guard the main gate of Edinburgh Castle.

The sculpture is made of more than 100,000 knives collected to raise awareness about violence.

Come for the oysters, stay for the priceless art honoring inventors across history and Scotland's favorite outdoor sports.

Colin Stokes "got a bit carried away" and built a castle that looks like something out of Tolkien.

These stark white cliffs were spat up by the sea and are slowly being retaken by it.

Explore nearly 400 years of English middle-class home life.

At the United Kingdom's only residential library you can sleep among the books.

A labyrinthine network of chambers with a storied past hides below Edinburgh's South Bridge.

A 4,500-year-old forest is slowly being revealed from beneath the sands of a Welsh beach.

A community of artists and entrepreneurs seeks a simpler life on London's waterways.

A beautiful Greco-Roman structure houses a well once believed to have healing powers.

This beautiful "lagoon" is actually a toxic soup filled with cars, carcasses, and trash. When warnings couldn't stop people from going for a dip, the town dyed it black.

This lovely little burbling creek is actually a deadly waterway that has dragged down everyone who ever set foot in it.

Below a historic English market town lies a secret underground city complete with kitchens, laundries, storerooms, and an underground lake.

A relic of Victorian grandeur hides beneath a busy South London road.

The cedar tree in Highgate Cemetery earned its title by accident.

A Victorian park cemetery, standing on the site of what was once the Great North Wood.

The largest stone circle in the world has ended up bringing up more questions than it has answered.

Besieged by war, this castle ruin has crumbled into a peaceful picnic spot.

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

Fascinating town where normal life interfaces with the occult.