History.com: These Vintage Hot Wheels Toys Are Worth Thousands of Dollars

How does a mass-produced die-cast toy car that originally sold for less than a dollar -- and fits in a small child's hand -- become a valued collectible trading for hundreds, or even thousands, of dollars? Five of the most valuable and desirable Hot Wheels castings, most of which are squirreled away in private collections and not available on the open market.