The Olympic National Park includes the Olympic Mountains dominating the Olympic Peninsula and more than 60 miles of coastline. The mountains have limited road access with hundreds of miles of trails. Many miles of the coastline are accessable only by foot. The Hoh Rain Forest is one of the rainiest places in the United States and features massive old-growth trees covered with thick moss. In 1976, Olympic National Park became an International Biosphere Reserve, and in 1981 it was designated a World Heritage Site.