The planting plan was designed to provide viewing corridors toward the city, with visitors enjoying 360-degree vistas from the top of the tallest hill. Some 830 trees from 32 species selected for their size, color, and heartiness—including a variety of oaks and sassafras—were planted on The Hills, with a mix of balled-and-burlapped and container techniques.  Photo 3 of 6 in New York's Newest Park Sits on Recycled Demolition Debris