The Antique Gas & Steam Engine Museum (AGSEM) is a living history museum founded in 1969.  It is located on  of county-owned land at 2040 N Santa Fe Ave. on the outskirts of Vista, California.  The museum is a non-profit 501c(3) organization, run by several paid employees along with volunteer help.
The museum is open almost every day of the year and has two bi-annual shows, on the 3rd and 4th weekends of June and October. The museum also has other public and private events throughout the year.
Exhibits at the museum include: