A Victorian Gothic masterpiece housing a world-class collection of rare books and manuscripts.

Catacombs turned marketplace.

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

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

The Argonaute submarine was the French navy's pride and joy in the 1950's.

The narrowest street in Paris.

Despite being considered a thoroughly American sport, basketball's oldest surviving playing field is found in the basement of a Paris YMCA.

The floorboard scrawling of a tragic madman is on public display outside a Paris hospital, much to the dismay of its opponents.

The recovered bones of martyrs slaughtered during The Terror are on display in this church crypt.

In the best of all possible worlds, everyone will get a chance to see this statue in which Voltaire's heart is interred.

Exquisite wall sculptures carved in secret by an early quarryman in an obscure corner of the Paris Catacombs.

Indents in the pavement are all that remain from a grisly death machine in Paris.

A museum of magic with a Sadist past.

In 2013, historians discovered a hidden room devoted to the art of making royals' hot chocolate.

An enormous alien invades Woking, England, as an homage to the H.G. Wells classic 'The War of the Worlds.'

This public pool is one of the last remaining lidos of the countless built in the 1930's as public works projects in the United Kingdom.