A live image of Popocatépetl, the volcano just up the way, visible on clear days on my daily walk to the bus stop at dawn.

More on Popocatépetl, from Wikipedia:

Popocatépetl (commonly referred to as El Popo or Don Goyo) is an active volcano and the second highest peak in Mexico after the Pico de Orizaba (5,610m). Popocatépetl comes from the Nahuatl words popōca ‘it smokes’ and tepētl ‘mountain’, thus Smoking Mountain.

Elevation: 5,426 metres (17,802 feet)

The first Spanish ascent of the mountain was made by an expedition led by Diego de Ordaz in 1519.