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Updated: Jul 21, 2011

Abstract: This curvy block is an American icon that attracts tourists from around the world. Hundreds of hydrangeas and flawlessly groomed shrubs bring a vibrant look to the road that is rarely found on city streets. How It's Unique: San Francisco's most recognizable street originally had a 27 percent grade, making it too steep for the first automobiles to conquer. In 1922, the eight curves were added, reducing the grade to 16 percent.Lombard Street was a two-way road until 1939. Read more: The World's 18 Strangest Roadways: Gallery - Popular Mechanics