The little-known second castle that William the Conqueror built in York.

An incredibly well-preserved piece of ninth-century Viking poop.

The metal frame is all that's left of a wicker sculpture which once towered over the M5 motorway.

Giant, friendly pelicans in Central London, the most unlikely of places.

The National Railway Museum in York is the largest railway museum in the world, attracting almost 1 million visitors per year.

One of the shortest streets in York has an especially odd name.

A rare wooden coffin set vertically into the Gothic arch of an ruined church.

This network of narrow, medieval passages has the most delightful name.

These medieval tunnels provided water to the city above through centuries of civil war and plague.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

A statue of the legendary Celtic warrior queen who fought the Roman invaders stands in one of the cities she once destroyed.

Ancient Egyptian wigs, South American feather headdresses, a bounty of anthropological artifacts in Oxford.

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

This logic-defying 16th-century Tudor manor still stands to the delight and astonishment of onlookers.

Follow the original medieval paths that wind through this intriguing section of the city.

A century-old tradition has culminated in a small but singular collection of feline effigies.

A statue marks the exact spot where The Boy Who Never Grows Up made his first literary appearance.

This London plaque marks the spot where David Bowie's famous alien made his debut.

Mysteriously stacked storefront paths give this medieval British town an iconic style like none other.

Eighty million natural history specimens call this gargantuan museum home.

After nearly 60 years, there's still a bear at Paddington Station looking for help.

London's smallest police station is barely the size of a phone booth.