Who says you need to spend money to enjoy your vacation? Some of the most fascinating cultural, scientific, and industrial landmarks in the country won’t cost you a single dime. From watching millions of coins stamped out to learning all about space missions, free public tours offer a unique look into American history and innovation. Whether you want to explore the highest court in the land or grab a few complimentary samples of fresh chocolate or beer, these 10 free tours deliver high value without breaking the bank.