The largest underground lake in Europe.

Hear the quietest sound from across the dome.

Perhaps the most scandalous statue of America's first president.

A wondrous old library overlooking the nation's capital.

An abandoned, decaying sculpture garden built by an eccentric physician in the 1920s now looks more like a forgotten cemetery.

The cremains of those who donated their bodies to science are buried in a tiny cemetery behind the building.

A master plumber has turned his love of art and toilets into a folk museum that's not taking the piss.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

A museum of magic with a Sadist past.

A haunting collection of the vanished and disappearing natural world.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

A Parisian exterminator's shop whose storefront displays stuffed rats hanging from traps.