A late-medieval Dutch castle with trick fountains in its whimsical water gardens.

This neighborhood of futuristic ball houses looks like an alien settlement in a science fiction film.

An overgrown and largely forgotten cemetery lies hidden within the outskirts of Amsterdam.

This 1920s Amsterdam neighborhood was built as a giant experiment in concrete construction.

Famed for its pie, this eatery has a hidden tunnel that allowed Catholics to secretly walk to church during the Reformation.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

Lima’s Museum of Anthropology is lined with thousands of elongated human craniums.

The Art Deco artwork depicts gilded carriers of deadly illnesses.

A collection of machines designed to break things for science.

This knockout museum lies in a sleepy corner of London.

Hackney's newest private museum and natural curiosity shop.

The world's oldest optical museum is an odd collection where the exhibits look at you.

The library houses an incredible collection of some of the world's most impressive books and manuscripts.

The collection contains over 25,000 items and details the painful dental practices of the past.

Tombstones and enigmatic inscriptions hide within a vault beneath a popular London arts venue.

This museum inside a museum tells the story of London's timepieces.

Taxidermied animals galore, by appointment only.

The barrel-made lookout from Shackleton's final ship is tucked away in the crypt of one of London's oldest churches.

A museum wholly devoted to juvenescence.

Explore nearly 400 years of English middle-class home life.

This home on a quiet suburban street is completely covered with vibrant mosaics.

This museum tucked below a charming cafe gives a brief snapshot of photographic history.

London's largest outsider art museum.

Traveling collection of amazing automata.