The first section of the park opened to the public on October 19, 1867, while it was still under construction. The segment that was open to the public included part of the East Drive between the north end of the park, at modern-day Grand Army Plaza, and Coney Island Avenue at the southeast corner. The park initially contained the Playground, which had a croquet lawn, a sailboat pond, a maze, and a summer house. By 1868, the open portions of Prospect Park were patronized by 100,000 people per month, and several miles of roads, paths, and walkways had been completed. The land for Prospect Park's Parade Ground was acquired that year. A series of pedestrian arches to separate pedestrian and vehicular traffic in the park were also built during this time.