I’m very glad to see that there is a number of Mesoamerican precolumbian art exhibitions doing the rounds in Europe during the past years. At least there are initiatives to educate them about the existence of ancient civilisations such as the Aztecs or the Mayas.
The most amazing exhibition I saw outside of the Americas on this subject was the Aztecs exhibition in Berlin (which was also in London and Tokyo). However, if you are really interested in these two civilizations, there is no better option than going to the National Anthropology Musem in Mexico City for a concise view. You can also visit the different ruins in the country if you want to have a better idea of how did they live, like Chichén Itzá or Teotihuacán.