Located southwest of Medora, this site memorializes the life and activities in North Dakota of Antoine de Vallombrosa, the Marquis de Mores, who arrived in 1883. Among his enterprises were a beef packing plant, a stagecoach line, a freighting company, refrigerated railway cars, cattle and sheep raising, land ownership, and a new town which he called Medora, in honor of his wife.
A visitors center and museum building was opened at the de Mores State Historic Site in 1974. The site is open from May 15 through September 15. The site includes an interpretive center, exhibits and video. Modern facilities.