Landscape architects plan and design land areas for parks, recreational facilities, highways, airports, and other properties. Projects may include subdivisions and commercial, industrial, and residential sites. People enjoy attractively designed gardens, public parks, playgrounds, residential areas, college campuses, and golf courses. Landscape architects design these areas so that they are not only functional but also beautiful and harmonious with the natural environment. Landscape architects plan the locations of buildings, roads, and walkways. They also plan where to plant flowers, shrubs, and trees. Landscape architects design and plan the restoration of natural places disturbed by humans, such as wetlands, stream corridors, and mined areas. A bachelor's or master's degree in landscape architecture usually is necessary for entry into the profession. In 2011, 68 colleges and universities offered undergraduate or graduate programs in landscape architecture that were accredited by the Landscape Architecture Accreditation Board, part of the American Society of Landscape Architects.