Taga Folding Cargo Bike
The Taga is an ingenious dutch tricycle which doubles as small cargo bike and baby stroller. Through a smart folding mechansim it can be turned from a bicycle with two wheels in the front to a stroller with a single front wheel. It can be equipped with a wooden box for transporting 2 children or a week's worth of groceries, including a crate of beer or with a light and comfortable buggy seat.
I bought mine from the auction of the Embacher Bicycle collection. Which means, that I own a bike that has been shown in museums around the world.