This great old postcard is one of the few things left of Happy’s Museum, identified as “four miles west of Jacumba,” but my guess is it was about two miles east of Bankhead Springs. From Google Earth, one of Happy’s rock houses is still standing, but nothing but foundations left of the other structures.
You can explore this area with my Joyride Guru book, Towering Old Highway. It takes you on Old Highway 80 from the Desert View Tower, west to Descanso. ⚙