Fantastic monument to Hollow Earth in Hamilton, Ohio?

By Rick Potvin@56

Truly a stunning pice of work in stone is to be found in Hamilton, Ohio-- right out in the open for all to see. This is a monument to Hollow Earth.

I'd like to know who built it and why... and why it has been overlooked and under reported.

The website where I found it is...
Is the Earth Hollow

Discussion and follow up notes.
MONUMENT - Hamilton Ohio monument to hollow earth is fantastic