Built in just a little over a week this preserved bunker was created to protect our most attractive POTUS while he was on vacation.

The Florence Nightingale Museum is home to the famous nurse's most treasured possession: her beloved pet owl.

The remains of Crystal Palace Great Exhibition of 1851.

A 2000-year-old Roman amphitheater lies just below Guildhall Yard.

A Victorian park cemetery, standing on the site of what was once the Great North Wood.

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

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

Winding paths and ramshackle mausoleums in the oldest "park cemetery" in London.

This former boomtown "island" is now submerged below Folsom Lake.

Hidden beneath the streets of London is a secret subway that only carried mail.

A Victorian natural history and ethnographic museum with wonderful turn-of-the-century, science-book-esque evolution displays.

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

Known as the "Dodo Manège," this carousel features a herd of animals that have disappeared—or may be gone soon.

Visible below the waves are memorials to the city's Gold Rush dead.

The self-proclaimed world's smallest museum, located next to a Massachusetts sandwich chain.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

London's creepiest cemetery was once the site of dueling magicians and mobs of stake-carrying vampire hunters.

A boutique perfumery fashioned to look like a Victorian-era shop.

A movable feast that is an East London institution.

A mysterious artist-run cabinet of curiosities and library.

Statue of a decomposing prince that once held his heart in its hand.

The mummified heart of Louis XVII, the lost dauphin of the French Revolution.

Museum on French naval history, with magnificent figureheads, a historic diving suit, and a boat used by Napoleon.

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