The Blue Hole


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

The Gateway to the Blue Hole, Castalia, Ohio (1936)
1936 vintage postcard showing the entrance gate to the Blue Hole in Castalia, Ohio.
Blue Hole Entrance, Castalia, Ohio (1940)
Linen postcard from 1940 showing 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 linen postcard shows visitors watching fish in the trout stream at the Blue Hole in Castalia, Ohio.
Trout Hatchery and Water Wheel at the Blue Hole, Castalia, Ohio (Date Unknown)
1930s linen postcard showing the Trout Hatchery and Water Wheel at the Blue Hole, Castalia, Ohio.
Walk Along Trout Stream at Blue Hole, Castalia, Ohio (Date Unknown)
Vintage linen postcard showing the walk along the Blue Hole in Castalia, Ohio.
Night View of the Famous Blue Hole, Castalia, Ohio (Date Unknown)
Vintage linen postcard showing a night scene at the Blue Hole in Castalia, Ohio.
Mill Pond and Fish Hatchery, Blue Hole, Castalia, Ohio (Date Unknown)
Vintage linen postcard showing the Mill Pond and Fish Hatchery at the Blue Hole in Castalia, Ohio.
Blue Hole, Castalia, Ohio (Date Unknown)
1930s vintage linen postcard showing the Blue Hole in Castalia, Ohio.
The Famous Blue Hole, Castalia, Ohio (Date Unknown)
Vintage linen postcard showing a group visiting the famous Blue Hole in Castalia, Ohio.
Entrance to Blue Hole, Castalia, Ohio (Date Unknown)
Vintage linen postcard showing 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 showing a beautiful spot at the Blue Hole in Castalia, Ohio.
The Aerating Water Wheel at the Blue Hole, Castalia, Ohio (Date Unknown)
Linen postcard showing the aerating water wheel at the Blue Hole in Castalia, Ohio.