celtic vetton sacred space nemeton altar of sacrifices sculpted in granite. guadarrama mountains near san lorenzo del escorial

abantos acer altar attraction beautiful celtic celts chair clouds del encina escorial europe felipe forest granite guadarrama heritage hill historic iberian ilex king known landmark landscape legend lorenzo machota madrid maple monarch monspessulanum montpellier moss mount mountain mountains national nature nemeton outdoor park patrimonio phillip pyrenaica quercus roble rock sacred sacrifices san scattered sculpted seat sierra sightseeing silla sky space spain stone tourism touristic travel tribe vetton