Seth Dixon's insight:
This image is from June 11, 2013, but if you click on the link you will see an image of Popocatépetl that is refreshed every minute. This massive volcano looms over Mexico City and plays a key role in the mythology of the city. The images are taken from a relatively new station in Tochimilco (clouds or intense weather might occasionally limit the visibility of the volcano).
Via Seth Dixon, Aulde de Barbuat