"Flood's Folly"
In "Flood's Folly", 10 February 1961, Beau Maverick is riding to Denver when a snowstorm forces him to take refuge in "Flood's Folly", an almost deserted hotel high on a mountain pass.
In one scene the backside of a jigsaw puzzle is signed and dated to 1875 (possibly June), which is said to be a year ago, putting "Flood's Folly" the episode in 1876 and Flood's Folly the hotel somewhere in the Rockies northwest, west, or southwest of Denver.