New York City's Central Park is the most visited urban park in the United States, with more than 25 million visitors each year. Designed in 1857 by the man who would become America's most famous landscape architect, Frederick Law Olmsted, and his partner, Calvert Vaux, Central Park was intended to provide New Yorkers with a serene and scenic "rural" refuge from the noise and bustle of city life. Yet transforming the rocky, swampy park site into the rolling meadows, lush woodlands, and pristine lakes would prove an extremely time-consuming and labor-intensive endeavor. Thousands of workers drained marshes, blasted away boulders, and planted a quarter billion trees, flowers, and shrubs to create the 843-acre green oasis in the heart of Manhattan as envisioned by Olmsted and Vaux.