Calar Alto (Observatory Road)

The highest paved road in Almeria province, climbing to the Calar Alto astronomical observatory at 2,168m on the Sierra de los Filabres plateau. The ascent from Gérgal takes the full measure of the range — 22km of consistent climbing through pine forest and open moorland, with the observatory domes appearing on the skyline a full 5km before the summit road arrives. The gradient averages 6.8% with several sustained sections at 10-12% as the road gains the upper plateau. Above 1,800m the landscape becomes genuinely alpine: cold, exposed, and strewn with glacially-smoothed rock. The road is open to cyclists year-round but can carry light snow in January — check conditions if visiting mid-winter. In clear conditions, the summit views extend from the Sierra Nevada to the west and the Mediterranean coast to the south.