16 things that are probably hiding in your closet that are now worth a ton

First-edition books

First editions of classic novels like “The Adventures of Tom Sawyer” and “The Wizard of Oz” could be worth between $900,000 and $1 million, respectively, according to a 2013 Buzzfeed roundup of rare first editions. But those aren’t the rarest finds – that honor goes to a 16th-century first edition of Nostradamus’ “Prophecies,” which was listed for a mind-blowing $21,000,000.