But at the time the land this area of Manhattan was flat and not very nice. A lot of stone and earth was brought to make the park's hills Half a million trees and plants were put in the ground. Paths and beautiful stone bridges were built. The lakes and streams under the bridges were not there before. The park was finally finished in 1876. Today people still walk and ride horses in central Park. They also ride bikes. Cars can go into the park. but they cannot go everywhere. On the weekend, they cannot go in at all