mattress sing Executable circular cement blocks town Because Ru
Geodesic Dome Greenhouse - Part 6 - Concrete Block Walls - YouTube
6 in. x 6 in. x 12 in. Solid Cylinder Concrete Block 6032 - The Home Depot
12 inch Round - Carroll's Building Materials (St. Petersburg, FL)
Several semi-circular cement blocks with short metal post in the center. Located about every 100' on the top of the water side of a levy. : r/whatisthisthing