The Blue Hole


The Blue Hole is a freshwater pond and was a tourist site from the 1920s to 1990 and had 165,000 visitors annually.

The Gateway to the Blue Hole, Castalia, Ohio (1936)
Vintage postcard (c. 1936) depicting the entrance gate to the Blue Hole in Castalia, Ohio.

Blue Hole Entrance, Castalia, Ohio (1940)
Vintage postcard (c. 1940) depicting the entrance to the Blue Hole in Castalia, Ohio.

Watching the Fish in the Trout Stream at the Blue Hole, Castalia, Ohio (Date Unknown)
Vintage white border linen postcard depicting visitors watching fish in the trout stream at the Blue Hole in Castalia, Ohio.

Walk Along Trout Stream at Blue Hole, Castalia, Ohio (Date Unknown)
Vintage linen postcard depicting a scene at the Blue Hole in Castalia, Ohio.

Night View of the Famous Blue Hole, Castalia, Ohio (Date Unknown)
Vintage linen postcard depicting a night scene at the Blue Hole in Castalia, Ohio.

Mill Pond and Fish Hatchery, Blue Hole, Castalia, Ohio (Date Unknown)
Vintage linen postcard depicting the Mill Pond and Fish Hatchery at the Blue Hole in Castalia, Ohio.

The Famous Blue Hole, Castalia, Ohio (Date Unknown)
Vintage linen postcard depicting the famous Blue Hole in Castalia, Ohio.

Entrance to Blue Hole, Castalia, Ohio (Date Unknown)
Vintage linen postcard depicting the entrance to Blue Hole in Castalia, Ohio.

One of the Many Beauty Spots at the Blue Hole, Castalia, Ohio (Date Unknown)
Vintage linen postcard depicting a scene at the Blue Hole in Castalia, Ohio.

The Aerating Water Wheel at the Blue Hole, Castalia, Ohio (Date Unknown)
Vintage linen postcard depicting the aerating water wheel at the Blue Hole in Castalia, Ohio.