A unique collection of gilded age mechanical pianos.

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

Cat art as far as the eye can see.

A hidden church in a hidden courtyard tells the story of the Miracle of Amsterdam.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

Lavish royal estate punctuated with heated greenhouses.

Elegant marble and old vaults fill this historic Dutch bank turned office space.

Oldest Museum of the Netherlands is a true cabinet of curiosities.

This Netherlands museum holds a gloriously mechanical collection of ornate musical automata.

The largest 19th century panorama in the world still in-situ.

A radio telescope for listening to the stars, based in one of the cloudiest countries in the world.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

An incredible menagerie of more than 3 million taxidermied animals at the oldest science museum in Europe.

These gutted monastery ruins still stand proudly in the middle of the Italian countryside.

The largest and most famous wax anatomical collection anywhere in the world.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

The only museum with its curator—and her pets—buried inside.

A miniature city, once ruled by the Queen of the Netherlands.

Three connected pink triangles memorialize persecuted gays and lesbians throughout history.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

This fairy tale forest hides scenes from some of the more obscure and bizarre Western nursery stories.

A little sculpture with a large wardrobe.

Museum in a swimming pool where the water still flows.