Massachusetts has 192 miles of coastline and small hills, shallow rivers, and lakes. Its highest point is Mount Greylock at 3,491 feet above sea level. The state is known for founding the first Thanksgiving and the Pilgrims' arrival at Plymouth Rock. Major tourist attractions include Martha's Vineyard, Nantucket Island, and Plymouth Rock, where the Pilgrims had the first Thanksgiving. The Boston Symphony Orchestra is one of the world's top orchestras, founded in 1881 and based in Symphony Hall. Agriculture includes cranberries, poultry, dairy, and fruits and vegetables from nurseries and greenhouses.