There are many things one can see in the Plaza de Armas in Cusco. The Plaza de Armas in Cusco is a large square near another smaller square. There’s a cathedral and a church (yes, both), but that isn’t what I want to talk about. Any guidebook will tell you about that. We have other things to see.
For example, you can see endless people offering you massages in the Plaza de Armas in Cusco. Endless. Sometimes three or more people in a row, each asking you if you want to buy a massage just after you told the person standing in front of them no. However, if you aren’t interested in seeing the endless people selling massages, you can always see the numerous people trying to sell you tours to Machu Picchu, or the dozens of people trying to sell you sketches and other artworks out of a large leather binder.
Yes, you can see all these things and more in the Plaza de Armas in Cusco. Supposedly there’s some kind of historical stuff interesting there, but clearly the massages, tour sales, and wall art to buy takes precedence.