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

A tongue-in-cheek arcade where the games are based on everyday life.

A 16th-century horror show built in a lovely Italian garden.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

Used as an example in one of the first dictionary entries for "museum" in 1706.

A remarkable medieval structure born from a 14th-century disaster.

The curious and tiny collection contains some very odd objects.

Long-secret natural history museum, featuring the skull of a "Terror Bird."

Ancient Egyptian wigs, South American feather headdresses, a bounty of anthropological artifacts in Oxford.

This giant wooden treehouse within a sprawling garden has its own eatery.

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

This unchanged Victorian park is rumored to have been the inspiration behind Peter Pan's Neverland.

This former abandoned hospital, a complex of stunning 19th century buildings, once housed 2,000 psychiatric patients.

Puzzles within puzzles hide a golden treasure in this hedge maze.

These lovely Turkish-styled baths were brought back to life after winning a reality show competition.

A museum wholly devoted to juvenescence.

St. Mary's Asylum was isolated and abandoned before being converted into a Bed and Breakfast.

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

One of the largest sculpture collections in the U.K. features history's greats, from Bob Dylan to Galileo, in bronze.

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

Follow the original medieval paths that wind through this intriguing section of the city.

Grab a cuppa at England's first and only domestic tea plantation.