A great place to visit
Driving along the M-614 from the town of Guadarrama to Navacerrada and approximately at km. 13,500 right in the pasture of the Swallow, you'll find an excellent vantage point from which you can see in all its intensity much of the Sierra of Guadarrama, right on your right-hand side.
The origin of the place's name comes from the nickname that it received from an old woman who lived in a road watchman's house in the area. The site has a small parking lot, a fountain from which I have never seen any water flow, and two excellent posters in two lecterns which indicate the names of the peaks and hills that can be seen from the site.