You've got me intrigued with this set of the broken concrete in arrow form on the hill, Steve.

Hi George!
I've been meaning to put the info in the captions, with some inserts, but alas for good intentions-- I do have a write-up in the album description, though!
www.ipernity.com/doc/289859/album/1319472?with=51251500
I wrote this arrow up for Atlas Obscura using these photos and that write-up:
www.atlasobscura.com/places/airmail-arrow

Thanks for those links, Steve. Fascinating historical information. We didn't have anything similar to the arrows here that I'm aware of, though there were rotating beacons at some airports.