Aztec World is the newest exhibition (online and in real-life) at the Field Museum in Chicago.
Much of the website is probably accessible to high Intermediate English Language Learners. There are good and short descriptions of job and social classifications in the Aztec culture.
Best of all, there are E-Cards that can be written and emailed that have examples of Aztec sculpture. A link to the image and what the student writes can then be posted on a teacher website or blog.
I’ll be placing a link on my World History page.