Weirdest Inventions From The Past
The Monowheel
One of the greatest innovations in human history was the wheel. But what happens when you try to create a single wheeled vehicle? Today it still exists for fun and entertainment. But in 1860s it was intended as a transportation device to get people from place to place. This invention was a major fail, mainly because the people struggled with steering it. But today we can enjoy it as something to goof around with.

Wikipedia