Illimani is a beautiful 6,438 m tall mountain that's visible from many places around La Paz and El Alto. It was quite a unique experience to watch the sunset illuminating it together with the city lights below turning on.
This spot right next to the Faro de Murillo cable car station is definitely one of the best viewpoints from El Alto, as it offers quite unobstructed views of most of La Paz with the mountains around it.