Bulgaria is a country with a historical and cultural heritage, and attractive natural landscapes, one of the most visited tourist destinations in Southeast Europe. Tourism, as an industry, has been an important source of economic growth. In 2008 Bulgaria was visited by 8.9 million tourists, measured as outlined by the World Tourism Organization. Tourists from three countries - Greece, Romania and Germany - account for 40% of visitors. The country has historical cities and towns, summer beaches, and mountain ski resorts. New types of tourism, including cultural, architectural and historic tours, eco-tourism, and adventure tours, are expanding the range of visitor experiences.