Started at the puerto de Navacerrada, summited Bola del Mundo and kept going to the top of nearby Cerro de Valdemartín. Then it was just a matter of going back the same way.
A wonderful sunny day with snow-covered summits
We drove from Pozuelo (Madrid) starting at 15:05, ascended on the normal route from Puerto de Navacerrada. The trail was always snowed but the weather was sunny and calm. The ascent was quick, when we reached the top we were eating something. We'd decided to follow to Valdemartín or Maliciosa but we couldn't because it was late and I'd forgotten my headlamp at home. So we descended to Puerto de Navacerrada and drove back to Madrid.