As a result, some areas in so-called Green Spain have been designated Biosphere Reserves by the UNESCO (National Reserve of Los Picos de Europa, Natural Reserves of Redes, Somiedo, Liencres and Fuentes del Narcea, the Reserve of Terras do Miño and that of the Estuary of Urdaibai). The Caves of Altamira have also been designated a World Heritage Site. Other areas of interest include the Aiako Harria massif, the cliffs of A Capelada and the Atlantic Islands, etc.
Green Spain also delights visitors with its artistic and historical heritage (cave paintings, pre-Romanesque, Romanesque, Gothic and Baroque architecture). Its museums are also an attraction and range from the avant-garde Guggenheim Museum in Bilbao to that of Altamira and Santillana del Mar. Special mention must be made of the country areas and the ways of life of its people, their customs and traditions, craft, fiestas and the excellent gastronomy and wines.