hikers climbing to the top of the mountain of la bola del mundo or alto de las guarramillas in madrid spain.

adventure altitude alto antenna antennas architecture blue bola building climbing cloud del emission equipment europe function grass guadarrama guarramillas hikers hiking landmark landscape las madrid mountain mountaineering mundo national nature navacerrada old outdoor outdoors park peak radio red repeater repetition rocket scenic sierra signal sky slope snow spain station telecommunications television top tourism tower transmitter travel was whose