Sewer Museum, Paris, France
Tourists have graced these subterranean tunnels since the 1890s and are still in use today. Bring a scarf or smelling salts, otherwise you could feel faint! Exhibitions teach the public about the history, the role of its workers, and the sanitation process. Visitors learn about the massive resources needed to keep a metropolis hygienic.
Currywurst Museum, Berlin, Germany
The Currywurst Museum is the only museum in the world dedicated to currywurst. Visitors will relish (no pun intended) the interactive exhibits, including the not-to-be-missed virtual currywurst making. Chill out on the sausage-shaped sofa and listen to Currywurst tunes on ketchup-shaped audio centers.
Museum of Broken Relationships, Zagreb, Croatia
The Museum of Broken Relationships serves up exhibits of personal objects left behind by those in broken up daliances. Each object has a description attached. Items on display include stuffed animals, shoes, photos, clothing and certain tools (think axe), vases, furniture and books, just to name a few. (featured image)