19th-century scientists would make the pilgrimage here to verify the precision of their measuring sticks.

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

Northern Ireland's Brobdingnagian stepping stones.

The ruins of this medieval castle in Northern Ireland have inspired artists from C.S. Lewis to Led Zeppelin.

This permanent collection of preserved bodies taken from Irish bogs is one of the leading authorities on such morbid mummies.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

The taxidermy remains of the first mammal ever cloned from an adult cell are on display in Edinburgh.

The most loyal of little dogs, or a Victorian era publicity stunt?

The final resting place of soldiers' loyal canine companions.

Charles Babbage's proto-computer, painstakingly brought to life.

The popularity of Sherlock Holmes led to the creation of his fictional address, turning the orderly London street numbers askew.

The watery entrance for condemned prisoners heading to the Tower of London is still visible along the Thames.

The handiwork of a underdog clockmaker who solved an impossible problem for an Empire, and forever revolutionized seafaring.

This luxury shopping lane has been protected by its own tiny police force for over a century.

Thanks to modern navigational tools we now know that the true prime meridian runs through a park next door.

A naturally mummified 2,000-year-old man.

A clock designed to run with perfect accuracy for 10,000 years.

The Metropolitan Police refurbished the blue box (perhaps not coincidentally) the same year "Doctor Who" returned to TV screens.

The monster at the center of the Darwin Center Spirit Collection.

Repository for more than 22 million pickled specimens.

Hear the quietest sound from across the dome.

Eighty million natural history specimens call this gargantuan museum home.

The famous winding walk at Chartres is surrounded in mystery and myth.

Enormous lake at the bottom of a unique cave system.