A beautiful medieval bridge allegedly constructed by the Devil.

This nondescript building hides an entrance to an underground nuclear tunnel system.

This uniquely shaped rock formation is one of Scotland's most iconic mountains and gives spectacular views in all directions.

The Egyptian-inspired last resting place of Lord Kilmorey.

A historic shipbuilding town is home to a sail-through fish-and-chips shop.

This former football stadium seems almost abandoned but is still in use by the next generation of Scottish sports stars.

Home to the longest wooden escalators in the world.

Go deep down into the earth to experience the world of Welsh coal miners.

An abandoned quarrying village turned commune is now a hub for learning the Welsh language.

The undercroft is a spectacular example of medieval Cistercian architecture.

Abandoned for over 20 years, this Art Deco seaside swimming pool is a magnificent waste.

One of the most spectacular 18th-century bridges in Scotland.

The oldest working Brewery in Britain.

Quirky Welsh observatory unites art and science.

These picturesque ruins crumble beautifully into the ocean.

A 14th century castle built on the seat of a mighty giant.

The ruins of a defunct limestone quarry still haunt this Scottish promontory.

These ruins of Francis Bacon's once-magnificent manor are hidden in the English countryside.

The alleged birthplace of Lady Jane Grey, who was executed at age 16 for claiming the throne of England.

Water-themed sculptures guard this unusually square structure.

This English medieval castle is where King John died of dysentery.

The lake that fills and empties itself at random.

The "Black Arch" guards the entrance to the picturesque Glens of Antrim.

A Victorian marvel of engineering is now a 21st-century tourist attraction.