Legal protection of the Montejo beech forest Historical milestone · Montejo de la Sierra, Sierra Norte, Madrid Image of Montejo de la Sierra, not of the place itself. A decree declared the 250 hectares of this southerly beech wood, owned by the villagers since the 15th century, a Natural Site of National Interest. It was a pioneering decision, and in 2017 UNESCO added it to its list of world heritage beech forests. 30 de agosto de 1974 Photo: Dirección General de Turismo. Consejería de Economía e Innovación Tecnológica. Comunidad de Madrid (CC BY 3.0 es) What to see and do in Montejo de la Sierra