Maker: Legoland 
Original Price: Free
Worth Today: $19,793*

A 2×4 gold brick went up for auction, along with other rare collectibles, like the 10226 Sopwith Camel, Wooden Duck, and San Diego Comic Con Zebra Batman, making Lego history as one of the most expensive products to come from the company. The oversized Lego was made of $205 worth of 14-karat gold.

The golden brick was originally a prize given to employees who had done something outstanding for the company. The one that went up for auction was awarded to a German employee in 1971. He’d improved the software for selling Legos and was awarded this solid gold Lego, as well as a thank-you letter for his work.