Greenwich is a wonderland of technological history, from the maritime workings of the Cutty Sark, to John Harrison’s timepieces at the Royal Observatory. The Fan Museum, however, is singularly dedicated to a device that has been in use for more than five millennia. Originally founded in 1991 by Dicky and Hélène Alexander to display their collection, the museum is said to be the first museum dedicated to handheld fans. It does not include any mechanized or electrical fans and is home to more than 5,000 fans and fan-related items dating…