Tourism industry is a major player and reaches a remarkable 14 per cent of the GDP. Tourism is concentrated around the towns of Davos, Klosters, Lenzerheide, Arosa, Flims, St. Moritz and Pontresina, which have large ski areas. There are, however, a great number of other tourist resorts in the canton, divided by the official tourist board for winter sports for example into categories "Top - Large - Small and beautiful" St. Moritz is said to be the cradle of winter tourism at all around 1860. Summer tourism is also an important source of revenue. Trekking, mountaineering, and mountain biking are some of the main activities. Business tourism is also a source of revenue, notably in Davos, where the World Economic Forum meetings are traditionally organised.