Parked motorcycles surround the Harley-Davidson Museum in Milwaukee, Wisconsin in this August 31, 2013., file photo. To catch a glimpse of Harley-Davidson Inc history, visit its Milwaukee ... more 
Parked motorcycles surround the Harley-Davidson Museum in Milwaukee, Wisconsin in this August 31, 2013., file photo. To catch a glimpse of Harley-Davidson Inc history, visit its Milwaukee headquarters, housed in the 111-year-old company's first real factory. Or tour its York, Pennsylvania, plant, which has cranked out motorcycles since the early 1970s and builds some of its biggest cruising bikes. REUTERS/Sara Stathas/Files (UNITED STATES - Tags: SOCIETY BUSINESS ANNIVERSARY TRANSPORT) less 
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Reuters | Photo By SARA STATHAS / Reuters
Mon, Apr 7, 2014 11:57 AM EDT