The Presidio's oldest building dates to the late 1700s, and got a total renovation in 2015, revealing gorgeous Spanish-Moorish adobe architecture. The free Heritage Gallery shows the history of the Presidio, from Native American days to present. Moraga Hall – the former officers' club lounge – is a lovely spot to sit fireside and also has free wi-fi. Thursday and Friday evenings, the Club hosts a dynamic lineup of events and lectures; check the website.