How Diego Rivera imagined the Aztec capital city of Tenochtitlan, with volcanoes and snow-capped mountains in the background. The city was a set of islands on Lake Texcoco, hence the canals and waterways, all painted in this gorgeous blue color. Mexico City is built on top of Tenochtitlan and everywhere it’s possible to get a brief glimpse of the civilization that lies underneath. These pictures do not do justice to the mural.