I'm not sure about ARKONS, but MIRI and CITY ON THE EDGE OF FOREVER were filmed on location in........wait for it.........

Mayberry U.S.A.!

I'm not kidding -- there's a link around here someplace with frame comparisons. For example, Kirk and Edith Keeler stroll right past Floyd's Barber Shop, and the tumbleweeds in MIRI roll by Ange's courthouse (!).
"Good night, Dr. Carruthers." "Goood - Bye, Roy................."