Ever since Audrey Hepburn gazed longingly through its windows, Tiffany & Co has won countless hearts with its glittering diamond rings, watches, silver Elsa Peretti heart necklaces, crystal vases and glassware. But wait, there's more, including handbags and travel-friendly gifts like letter openers. Swoon, drool, but whatever you do, don’t harass the elevator attendants with tired ‘Where’s the breakfast?’ jokes.