General View of Blue Hole - Castalia, Ohio - Vintage Postcard 1871 has some smudging from postage

has some smudging from postage ink

Front: Hoover Dam

Back Information: "Nightly thousands of fans gather at the World's most modernistic Dog Track

or a walk through the woods

General View of Blue Hole - Castalia, Ohio - Vintage Postcard 1871 has some smudging from postageOn front: General View of Blue Hole, Castalia, Ohio. On back: Castalia Blue Hole. Discovered by Robert Rogers, 1760. The most interesting sight in the Fire Lands today. Depth unknown. Visible depth, 45 ft. Source underground river. The temperature 48 degrees winter and summer. It never freezes and is not affected by floods or drought. Discharges 5,000 gallons of water every minute. Fish cannot live in Blue Hole, as it is absolutely free from air or