Prince Edward Island National Park of Canada is home to sand dunes, barrier islands and sandspits, beaches, sandstone cliffs, wetlands and forests. These diverse habitats provide a home for a variety of plants and animals, including the threatened Gulf of Saint Lawrence Aster and the endangered Piping Plover. The National Park also features unique cultural resources, notably Green Gables, part of L. M. Montgomery's Cavendish National Historic Site, and Dalvay-by-the-Sea National Historic Site. In 1998, six kilometres of the Greenwich Peninsula were added to the Park to protect unique dune formations, rare plants and animals, as well as archaeological findings dating back 10,000 years.