Although smaller than nearby Sotheby's, Bonhams always has a fascinating series of auction items, including art, books, jewelry and even classic cars. It's quite a posh place but anyone can walk in off the street to gaze at gorgeous items. So have a good look around here and the nearby antiques dealers on Bond Street. It's also free to attend auctions, but you'll have to register in advance before you can bid. So if you're broke, resist the temptation to acquire a bidding paddle in case you can't stop yourself from waving it around.