Don't Miss It
I was in the Yuso Monastery, which is the bigger monastery of the two: the Yuso one (below) and the Suso one (above). You can visit the monastery with a guided tour, it is worth it. You can buy the entrance right there. There are visits every 40 minutes.
You can also visit the Suso Monastery, which is smaller. From there, there is a path that leads you to the Yuso Monastery. It is a 40 minute walk, which is very nice. Not to be missed.