A cave dwelling that was started by the Celts, expanded by monks, and finished by knights.

Since 1874, this macabre collection has developed into a museum devoted to Scotland Yard's mementos of dastardly deeds.

The curios of pharmacist and collector Henry Wellcome.

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

Tucked away in the Leiden city hall are a group of works by famed artist MC Escher.

Machismo turned on its head: the lady's hand goes to the dude with the bigger brain.

The oldest continual pilgrimage site in Britain was supposedly created by a gruesome beheading.

This museum houses an imposing skeleton army comprised of creatures great and small.

This lower Manhattan bar is set up in an old bank vault that rests beneath a skyscraper that hides even more historic splendor.

A flourishing garden with pigs, donkeys, goats, rabbits, guinea pigs, chickens, ducks, and sheep.

The simple log cabin of a famed loner and naturalist stands preserved as a symbol of the ultimate DIY lifestyle.

"Purveyors of traditional sweets and vintage treats."

Wedged between two buildings at the Great Ormond Street Hospital is this secret music installation.

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

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