For centuries, humans from all around the world have tried to use different things as money. Some forms, which most people are familiar with today, have been effective catalysts for trade over thousands of years. Other currencies, from squirrel pelts to parmesan cheese, have had their time or place in human history, but were ultimately unsuccessful or made obsolete.

The path to finding the best money has been long and riddled with trial and error. Here are just some of the world’s strangest currencies that we discovered in our research.

Source: The Money Project