Wikipedia has a list of where the American flag is on continual display. Most I can figure out why, but there are others I can’t - namely
Mount Slover limestone quarry (Colton Liberty Flag), in Colton, California.
Washington Camp Ground, Bridgewater, New Jersey, Thirteen Star Flag.
The Worcester, Massachusetts war memorial
The plaza in Taos, New Mexico
The Mount Moriah Cemetery in Deadwood, South Dakota.
Why do these places get special rules for displaying the flag?