The O'Donnell Heritage Museum is a local history repository in O'Donnell in Lynn County in West Texas. A part of the museum includes a room of exhibits on the actor Dan Blocker, who portrayed the Hoss Cartwright character for thirteen years on NBC's Bonanza. Blocker was reared in O'Donnell though born in DeKalb in East Texas. Because of the Blocker room and memorabilia, the facility is sometimes called "The Dan Blocker Museum." Hours are Tuesday through Saturday, 10 a.m. to noon and 1 to 4 p.m., and Sunday, 1-4 p.m.