A complex, nine-layer maze on the grounds of a Venetian doge's playground.

A museum of magic with a Sadist past.

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

A lone cannonball remains lodged in the walls of the Hotel de Sens as a sober reminder of a revolution.

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

A font of vintage porn on the silver screen.

Where the high court feasted, frolicked, and high courtesans put their royal lovers' diamonds to the test.

A haunting collection of the vanished and disappearing natural world.

One of the oldest medical collections in Europe focusing on rare surgical instruments.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

Inside a former cabaret, seven floors of erotic art.

A walk through the historic city center, under the streets of Seattle.

This family mausoleum is steeped in symbolism and looks more like a fantasy location than a grave.

Seattle's own bad art museum located inside Cafe Racer.

Beneath the impressive baroque cathedral that rises from the center of Berlin lies the largest collection of Prussian royals in the world.

The bears of Bern have been a city highlight for over 500 years.

This elaborate Byzantine-style building was designed for a not-so-pretty purpose.

Catacombs turned marketplace.

A recently restored Shoreditch landmark with ties to Jack the Ripper.

Spitalfields' regal market goat is said to be a monument to the area's migrant population but most are pretty sure it's just a goat.

The curios of pharmacist and collector Henry Wellcome.

The anatomical-pathological collection of a man who changed surgery.