A Victorian park cemetery, standing on the site of what was once the Great North Wood.

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

Mary Kelly was last seen here before she was murdered by Jack the Ripper.

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

A network of concealed passageways lies within a busy London Underground station.

Hear the quietest sound from across the dome.

A vast overgrown cemetery, once known as one of London's "Magnificent Seven."

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

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

Eighty million natural history specimens call this gargantuan museum home.

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

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

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

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

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

This ornate Victorian marketplace was the setting for Diagon Alley and the Leaky Cauldron in the Harry Potter films.

Vienna's underworld of tunnels and subterranean rivers made an iconic appearance in a 1949 Orson Welles film.

Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

The topiary maze at the Habsburg hunting lodge.

The resting place for anonymous victims of the Danube's dark waters.

The crypt of the imposing Stephensdom holds royal intestines and thousands of skeletons.

This is the largest cemetery in Ireland and the first cemetery museum in the world.

A nun spent 16 years painting the stunning Celtic mural that covers the interior of this WWI memorial.

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