A 200-year-old collection of oddities and medical paraphernalia.

This series of Scottish caves has no clear purpose other than baffling historians.

A book bound in the skin of an infamous criminal, along with countless other specimens.

Tiny effigies of the victims of Edinburgh's famous Anatomy Murders.

360° views of the city plus five floors of optical illusions and hands-on science.

17th century streets hidden under Edinburgh were once a breeding ground for the black death.

A 18th century graveyard and its astonishing cortege of macabre iconography.

One of Ireland's most infamous prisons for rebels including men, women and children.

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

Dublin's "Dead Zoo" serves as a window to Victorian museum design.

An Irish church where an 800-year-old mummy is reaching out of his coffin as if to shake hands.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Artists and musicians now rule over this former rail station.

Catacombs turned marketplace.

Repository for more than 22 million pickled specimens.

Eighty million natural history specimens call this gargantuan museum home.

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

One of the world's largest collections of pathological specimens.

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

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

A subterranean ice warehouse that has lain hidden beneath central London for over a century is now open to the public.

This South London cemetery holds the remains of more than 15,000 people.

A collection dedicated to the treatment of disease, held in London's oldest hospital.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.