Joined together, the 18C mansions of Caumont and Montfaucon are home to the splendid Yvon Lambert art collection and to temporary exhibitions. Most of the avant-garde artistic trends beloved of the collector from the 1950s to the present day are represented. Sol LeWitt, Basquiat, Louise Bourgeois, Yan Pei Ming, Boltanski... practically all the major figures of the contemporary art world are on show.