William Blake claimed to have painted this gothic masterpiece after encountering this nightmarish being in a vision.

This Viking gravestone carved in a rare runic style was dug up from a London churchyard.

Tucked away in the Tower of London is the weapon once used to execute high-profile prisoners.

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

The "lost friend” is the most famous of the six moai statues that were removed from Easter Island.

No one knows who created the statues or if they are arranged properly—let alone the artwork's real name.

A wonderfully eclectic Victorian aquarium lies in the basement of the Horniman Museum.

These official units of measurement—including chains and perches—lie hidden beneath tourists' feet in a popular London hub.

The first geometric self-supporting spiral stairs in Britain are a truly beautiful sight.

Explore nearly 400 years of English middle-class home life.

The library houses an incredible collection of some of the world's most impressive books and manuscripts.

Never actually a tree at all, this spot was the site of London's public hangings for nearly 600 years.

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

This artist's home turned gallery/museum preserves the creator's love of "Eastern" influences.

Where condemned pirates met their grisly end at the gallows on the River Thames.

The monster at the center of the Darwin Center Spirit Collection.

Dictionary Johnson’s favorite feline.

This museum tucked below a charming cafe gives a brief snapshot of photographic history.

A relic of Victorian grandeur hides beneath a busy South London road.

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

Giant, friendly pelicans in Central London, the most unlikely of places.

A Roman spa buried deep beneath the City of London.

A clock designed to run with perfect accuracy for 10,000 years.

The John Snow Memorial marks the epicenter of London's 1854 cholera epidemic.