Hi OllieYido,
Welcome to the forums of Travel Amazing South America. During my travels in South America I've not seen many murals and museums of Che Guevara but maybe I wasn't paying attention, so many things to see and to do.
There is a Che Guevara museum in Alta Gracia, not too far away from Cordoba, in Argentina. Also in Argentina there is an Ernesto "Che" Guevara Provincial Park in Caraguatay, a municipality some distance away from Puerto Iguazú. He spent part of his childhood there.
Obviously Cuba is the place to be to encounter Che Guevara memorabilia.
Best wishes,
Mark
