This hidden green space is the city's second largest conservatory.

This luxury shopping lane has been protected by its own tiny police force for over a century.

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

The Columbia Road Flower Market is now open every Sunday, rain or shine.

An small and easily overlooked archaeology museum chock full of Egyptian artifacts.

A hidden treasure in London with a rich medieval history, and the resting place of many luminaries.

Eighty million natural history specimens call this gargantuan museum home.

Catacombs turned marketplace.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

An unusual round church in London with a Templar past.

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

A mass grave for victims of one of the city’s worst fires.

'Cause the fence start shaking, the earth was quaking.

A museum on the history of Paris, including a set of Napoleon's toiletries, Proust's room, and relics of the Revolution.

Ozymandias’ time-keeping temple.

A battle between nature and architecture in the Cambodian jungle.

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

A collection of artworks exclusively created by the mentally ill that was almost burned by Nazi culture police.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

A huge cathedral single-handedly constructed by one eccentric monk.

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

This massive collection of British military artifacts includes the heartbreaking personal letters of the men in the trenches of WWI.

Abstract dinosaur models in London.

A Victorian cemetery in the heart of Brooklyn remains a popular mecca of morbid curiosity.