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.

This legendary stone is of unknown origin, and throughout history has been a literal touchstone for British leaders.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

Hidden behind a wall for decades, this masonic lodge was only rediscovered during renovations.

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

The sixth of London's "Magnificent Seven" cemeteries, and a source of unlikely inspiration to Beatrix Potter.

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

A toy store with a century-long history preserves the craftsmanship of playthings of the past.

A Victorian natural history and ethnographic museum with wonderful turn-of-the-century, science-book-esque evolution displays.

The remains of Crystal Palace Great Exhibition of 1851.

The final resting place to 300 Victorian-era pets hides inside the city park.

A cluttered and astounding collection of antiquities and curiosities.

This wildly-tiled artist's palace is a living and growing account of the creator's life, loves, and labors.

An incarceration museum on the spot of possibly the oldest prison in England.

A historic London cemetery now serves as a nature park incorporating gravestones & memorial statues.

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

The site of London's first coffee house has been serving refreshments of one kind or another for 360 years.

Eighty million natural history specimens call this gargantuan museum home.

Catacombs turned marketplace.

The largest of London's subterranean rivers and once a mad, bad center of London life.

In this cobwebbed old operating theater, you can practically hear the screams of the unanesthetized patients.

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

Hear the quietest sound from across the dome.

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