France's most famous cemetery, with some of its most curious tombs.

Apartment complexes built into huge repurposed natural gas tanks.

A spooky juxtaposition of caves and graves gives this legend-filled cemetery a particularly haunting vibe.

Hidden in a grotto 26 feet below Nottingham's oldest hotel, this stylish subterranean drinking den is notoriously hard to find.

Inspired by a dream, a hermit carved out a home in this sandstone bank to live a life of contemplation and prayer.

An engineering error ensured this cavernous 350-foot-long subterranean thoroughfare was never used as intended.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

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

This 1920s Dutch barge is now a floating bookstore.

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

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

A collection of comics, graphic novels, animation and caricatures devoted to exploring this often overlooked art form.

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

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

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

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

Hear the quietest sound from across the dome.

Eighty million natural history specimens call this gargantuan museum home.

Catacombs turned marketplace.

One part local history, 99 parts gruesome haunted house.

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

A 300-year-old tea shop that brought tea to the English people, not to mention the Queen herself.

These quintessentially English stepping stones were built for Victorian tourists.

A collection of early 19th century trams set in a reconstructed period village.