Lookout of Los Andes
A mandatory stop when you go to the Colca Canyon from Arequipa. On a good day you can see up to 6 volcanoes from here. I'm not sure if it is a custom for tourists or the locals, but at the top there are plenty of stones piled on top of each other. It is 4900 meters where this beautiful viewpoint is located, so you have to be careful with altitude sickness.