Quick!  Search your bookshelf for your oldest copy of Harry Potter and the Philosopher's Stone.  Why?  Because it could be worth all of the gold in Gringott's Bank.

OK, that's a bit of an exaggeration.  Harry Potter alone has at least $1.2 million stashed away in the fictional financial institution - but if you have a copy of a first edition, first impression of the book that launched one of the most successful media properties of all time, you could cash in on quite a bit of gold yourself.  See, the very first printing of this book is rare.  So rare, in fact, that only 500 were ever made.  This particular printing contained several typographical errors (which makes it a super hot collectible), and one of the books from this run sold this week at the prestigious Bonhams auction house in London for a whopping $100,000!

According to WQAD, the errors that make this copy so valuable include the word philosopher is misspelled on the back cover, and Harry’s list of required school supplies includes “1 wand” twice.