Guadarrama is a town and municipality in the Cuenca del Guadarrama comarca, in the Community of Madrid, Spain.
Its population is 13,032; the population swells to approximately 60,000 in summer.
Its name comes from arabic Wadi-ar-ramla river.
Guadarrama achieved the status of "villa" under Fernando V of Castile on November 22, 1504. Fernando VI ordered the building of a road to A Coruña through the Guadarrama Pass, through which passed the Grande Armée with Napoleon searching For John Moore's Army in 1808.
Wikipedia https://en.wikipedia.org/wiki/Guadarrama
Coordinates 40°40'24.403" N -4°5'21.808" E