Take a tour of Lombard Street in San Francisco, United States – part of the World’s Greatest Attractions series by GeoBeats. Visitors driving in San Francisco, beware! There is a street here with an international reputation. Lombard Street is a prime contestant for the title of Curviest Road in the World. This famous street has a quarter-mile section that slopes at a 27 degrees grade. The road goes through a series of eight switchbacks with a speed limit of five miles per hour. This section is banked with colorful flower beds and lined with expensive homes. The street itself is one-way going downhill for this stretch, but pedestrians can attempt the climb. Many find entertainment in simply watching drivers and their antics as they navigate Lombard Street.