We've all made mistakes that have hurt our wallets more than anything else. Maybe we used a non-affiliated ATM in a rush and had to eat that $2.50 charge, or perhaps we bought the wrong paint color but couldn't return an already-opened canister.
But in the grand scheme of financial errors, a dollar here and there pales in comparison to the most expensive mistakes in history. These are the mistakes that would clean out just about anyone's bank account or make them miss out on a lifetime's worth of riches.
If you aren't sitting down, you might want to do so, because these people, cities, and companies lost so much money that it might make you feel faint!