Who doesn’t want a little oddity in the middle of a park? The Hollow Earth Theory Monument stands in the middle of the Symmes Park Playground in Hamilton, Ohio. Its history is interesting, to sa...
Follow the stories of the traveling geospatial scientist
Who doesn’t want a little oddity in the middle of a park? The Hollow Earth Theory Monument stands in the middle of the Symmes Park Playground in Hamilton, Ohio. Its history is interesting, to sa...