Markham Museum is a 25-acre (10 ha) open air museum, located in Markham, Ontario, Canada. It is dedicated to the preservation of old buildings and artefacts from Markham's past. The site features nearly 30 buildings: houses, barns, sheds, a train station, a school, a general store, a church, a blacksmith, a harness shop, a saw mill, a cider mill, and many more. One of the oldest buildings is the Hoover House, built in 1824 by a Mennonite family who were originally from Pennsylvania.