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

The sign marks one of the endpoints to mainland Britain's longest overland travel route.

An ancient knight and a symbol of the city's freedom.

A fantastic Christmas tradition where defecation meets the manger.

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

A historic Christian shrine nestled within a spectacular natural cave.

Legends surround this natural rock formation that looks like a Moorish king wearing a crown.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

This amazing example of Valencian Art Nouveau looks more like a cathedral than a public market.

This jewel of an engine is one of Northern England's finest surviving legacies of the Industrial Revolution, even catching the eye of Henry Ford.

The UK's largest private house was the subject of a long-lasting political dispute.

A folly built to satisfy a gentleman's bet that he could drive his horses through the eye of a needle.

The remains of a historic kiln once used to produce the famous Rockingham porcelain.

This folly built to commemorate an aristocratic victory over Catholic rebellion plays tricks on the eye.

The oldest surviving glass furnace cone in Western Europe.

An oddly shaped tower built to mark the acquittal of Admiral Keppel in a controversial 1770s case.

In England, a barn-turned-wedding venue dates back to the 13th century.

This oddly placed 15th-century church is one of only six bridge chapels left in England.

As part of a larger public art project, three pillars honor the past of Wincobank.

In this quiet English suburb, giant steel hands and feet dot the landscape.

It's known as the "Full Monty school" thanks to its role in the beloved British comedy film.

In England, an 18th-century water-powered workshop still stands.

This magnificent mural was created with over 30,000 colored bricks.

Three memorials honor the victims of the worst sports stadium disaster in Britain.