Within the City, a group of small (100 feet tall) mound-like objects appear to be arrayed in a grid-like pattern.

Hoagland first noticed these objects, but Crater and McDaniel (1996) found that a subset of these mounds fall on a rectilinear grid with a one/square root two scale (figures 20 and 21).

Read about Dr. Crater's analysis of these mounds at http://www.mcdanielreport.com/summary.htm