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

Eighty million natural history specimens call this gargantuan museum home.

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.

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

It is said the legendary wizard once lived in this sea cave beneath Tintagel Castle.

This historic covered bridge contains a series of macabre paintings that communicate one thing: everyone dies.

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

A historic arboretum and non-conformist, non-denominational park cemetery.

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

A monument to the thrice mayor of London who according to lore made his fortune by selling his rat-chasing cat.

The first regular high-definition TV transmissions were made from this seemingly out-of-place mast located on one corner of a Victorian-era entertainment venue.

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

A naturally mummified 2,000-year-old man.

One of London’s rare Tudor-era buildings is a fate-defying gatehouse for a church.

A plaque hangs near the execution place of the Scottish Independence leader famously depicted in "Braveheart."

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

A memorial for public executions that dates back to the 14th century.

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

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

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

The commemorative stone column conceals a secret laboratory.

The Great Fire of London and the regulation of one-way streets both started in this alley.

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