This tough climb rose to fame during the 2012 Vuelta a España, when the final stretch to the summit was paved.
It's almost 26 kilometers long, with a significant amount of elevation gain.
The first six kilometers are easy, but from there, things get complicated: gradients of 5, 7, 9, and even 11% await you all the way to the Pajares pass. And this is where the fun begins: the ski resort's paved slopes with gradients reaching 25%.
Of course, if the day is clear, the views will reward the effort.