The signs of a long buried road can still be found hidden beneath a London sewer grate.

A fantastic castle rumored to be the birthplace of King Arthur.

This London pub hides a peculiar secret: a recreation of the rooms shared at 221b Baker Street by Sherlock Holmes and Dr. Watson.

The most iconic structure in Scotland has been home to bishops, colonels, and Sean Connery characters.

Northern Ireland's Brobdingnagian stepping stones.

The atmospheric road was never meant to be so creepy.

Famously misunderstood wonder of the ancient world

These fantastically named natural pools look like something out of a Scottish myth.

Hidden beneath the streets of London is a secret subway that only carried mail.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

Abstract dinosaur models in London.

The remains of Crystal Palace Great Exhibition of 1851.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

A community of artists and entrepreneurs seeks a simpler life on London's waterways.

An eccentric 18th century naval officer built a ship's quarterdeck on his roof, the inspiration for Mary Poppins's "Admiral Boom."

A historic house left in "dramatic still life."

The Columbia Road Flower Market is now open every Sunday, rain or shine.

Taxidermied animals galore, by appointment only.

Catacombs turned marketplace.

Spitalfields' regal market goat is said to be a monument to the area's migrant population but most are pretty sure it's just a goat.

Scattered throughout London are ancient remnants of the city's former bounding wall.

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.

One of the few remaining casualties of the London Blitz, this destroyed church has become an enchanting public garden.