Saint-Eustache, a key city in the RCM of Deux-Montagnes, stands out through its diverse activities and events. Old Saint-Eustache is home to the Légaré flour mill, the oldest mill still in operation in North America using only the power of water to grind flour. Across from the mill is the Globensky manor, a cultural and heritage house offering exhibitions on a variety of topics including the 1837 rebellion. Visitors to the manor can also enjoy guided or unguided tours.