The Chateau des Allymes (Castle of Allymes) has preserved intact all the purity of its military architecture designed for defending the territory in the Middle Ages. The Chateau des Allymes is made up of two sections, the upper court formed by four curtain walls linking the square tower (dungeon) to the round tower (watch tower), and the outer bailey with vestiges of the large fortification wall and a small watch tower. A 1960 listed historyic monument, the Chateau des Allymes was saved from ruin and has been open to the public since 1966.

Animated by the Association des Amis du Château des Allymes (friends of the chateau), it now houses exhibitions, concerts, conferences, etc. It has been the property of the town of Ambérieu since 1984.
For the 50th anniversary of the listing of the Chateau, a new furnished permanent exhibition room, devoted to René de Lucinge (1553-1624), lord of Allymes, who was actively promoted the integration of the Ain into France in 1601, will be open to the public as of October 2010.