A hermit's tiny cell built into the cliffside that saved him in South Pembrokeshire.

Bronze sculpture celebrating the relationship between Churchill and Roosevelt.

Now famous as the "Harry Potter bridge," this impressive concrete viaduct has long been an icon in its own right.

This short bridge is the only thing connecting a tiny Irish island to the mainland.

This crumbling folly looks like an enchanted left over from Middle Earth.

This foolish Victorian sea fort was converted to a deluxe hotel.

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

This cramped crevasse saw the entire population of its island suffocated inside its depths.

The last inhabitants of one of the U.K.'s most remote islands were evacuated in 1930.

This abandoned asylum in Wales might look haunted, but it's still beautiful.

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

Western Europe's only representation of a Roman goddess still in its original location sits in an unassuming park.

A small island abbey is the final resting place of many medieval Scottish monarchs, including the real Macbeth.

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

A 6th-century stone lies at the site of the mythical battle waged between King Arthur and his nemesis Mordred.

These ancient sunken lanes were naturally tunneled into the soft ground by countless footsteps.

A hidden treasure in London with a rich medieval history, and the resting place of many luminaries.

Accessible only at low tide, the deserted island is dotted with World War II ruins.

One of the oldest and certainly best preserved Cistercian abbeys still in existence.

This Scottish bridge seems to compel dogs to leap to their death.

The largest cave chamber in Britain—big enough to fit a whole cathedral inside.

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.

English antique dealers with a taste for the unusual.

A rocky sea serpent hides caves, blowholes, and a spectacular natural bridge.