The Stonehenge of Wales is one of the grandest neolithic dolmens still in existence.

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

A giant gleaming memorial named for a coal miner who gave his life to the pits.

The longest canal aqueduct in England was built without a plan to get water past the moving boats.

Harry Potter once visited this massive limestone cliff, which was carved by an ancient glacial river.

A relic of medieval punishment marks the center of this quintessential English village.

This building was once a town hall, a fire station, a prison, a dairy market, and the target for two marksmen.

This Victorian footbridge over the River Tees was originally built to carry water from the high moorland to the industrial towns on the coast.

These upturned herring boats make nifty storage sheds for fishing goods.

Twice a day this ancient path disappears with the tides, leaving the Holy Island of Lindisfarne out to sea.

This museum honors the young maritime hero who became an unexpected Victorian-era celebrity.

A plaque marks the underground site of one of London's "lost rivers."

It is still illegal to "quarrel" at this unlikely urban oasis built on top of an electrical substation.

This five-star hotel was originally a swanky parking garage.

The site of the notorious Great Train Robbery of £2.6 million, one of the biggest heists in English history.

This high-speed test track is popular with car manufacturers, speed freaks and orbiting astronauts.

A long-buried ancient ruin unearthed right in the middle of the city.

Three underground crypts and a pointed arch under the bell tower make this cathedral unique among Romanesque churches.

Geometry and mystery come together in an epic show of octagonal masonry.

Skulls and skeletons are omnipresent in this church dedicated to souls trapped in purgatory.

People have been living in the cave houses on this Italian hillside since the Neolithic era.

Southern Italy's spinning top village.

The sunlight passing through the opening of this huge cave system creates a magical effect.

A dead saint, a deadly poison, and a mysterious holy ooze.