Fossils 35 million years old, a fine collection of archaeological finds from the region (a superb 12C wrought-iron grille from the former Abbaye de Morigny; the head of a king of Judah from the Notre-Dame collegiate church) and canvases by local artists (such as Édouard Béliard, who joined the Impressionist movement, and Félix Giacomotti, an academic artist) are all displayed in this museum which bears witness to the region's rich history.