1.)
There is a really long, really wide, road extending from the border all the way up toward Tucson.
It begins here:
https://www.google.com/maps/d/u/0/viewer?mid=1qB9aTtRTkQTDjNEaBTKYI_uLcODYHRbH&ll=31.492006234927263%2C-111.57246143565368&z=19
It's not meant for cars. It's meant for horses.
The path is blocked by ditches:
https://www.google.com/maps/d/u/0/viewer?mid=1qB9aTtRTkQTDjNEaBTKYI_uLcODYHRbH&ll=31.495725646199674%2C-111.57251776204299&z=20
Dirt walls:
https://www.google.com/maps/d/u/0/viewer?mid=1qB9aTtRTkQTDjNEaBTKYI_uLcODYHRbH&ll=31.496741096960367%2C-111.57249093995284&z=20
Rock walls:
https://www.google.com/maps/d/u/0/viewer?mid=1qB9aTtRTkQTDjNEaBTKYI_uLcODYHRbH&ll=31.545240034303003%2C-111.57254592523765&z=20
Potholes from hell:
https://www.google.com/maps/d/u/0/viewer?mid=1qB9aTtRTkQTDjNEaBTKYI_uLcODYHRbH&ll=31.58822585880149%2C-111.57264919028472&z=20
Along the way are horse pens, and it is zig-zagged with 'one lane' dirt 'roads'. Note the size of the roads compared to the path.
https://www.google.com/maps/d/u/0/viewer?mid=1qB9aTtRTkQTDjNEaBTKYI_uLcODYHRbH&ll=31.5987262006104%2C-111.57261432156753&z=20
Ten to fifteen miles in we encounter an X… out in the middle of nowhereland. They tend to occur where roads come near the path, probably because it's easier to step out of your vehicle to paint an X than it is to step off your horse.
https://www.google.com/maps/d/u/0/viewer?mid=1qB9aTtRTkQTDjNEaBTKYI_uLcODYHRbH&ll=31.602633825854966%2C-111.57245473013114&z=20
About 25 miles further we encounter a 2nd X. Trust me, I didn't miss any - I traveled the wwhhoooolllee length by hand.
https://www.google.com/maps/d/u/0/viewer?mid=1qB9aTtRTkQTDjNEaBTKYI_uLcODYHRbH&ll=31.768507732545032%2C-111.51494816885184&z=20
You might be wondering where the road is. It's just a little south. Someone went off-roading to paint that X.
https://www.google.com/maps/d/u/0/viewer?mid=1qB9aTtRTkQTDjNEaBTKYI_uLcODYHRbH&ll=31.767535151177444%2C-111.51483551607322&z=20
Perhaps 5 miles later, and we encounter six more X's.
https://www.google.com/maps/d/u/0/viewer?mid=1qB9aTtRTkQTDjNEaBTKYI_uLcODYHRbH&ll=31.801794520306995%2C-111.47746295676421&z=14
If you'll notice the red pin on the left:
https://www.google.com/maps/d/u/0/viewer?mid=1qB9aTtRTkQTDjNEaBTKYI_uLcODYHRbH&ll=31.784273412127632%2C-111.51401073680114&z=19
It marks a mansion owned by the Bertarelli family. They control the Ares-Serono Group, a pharmaceutical company. That company recently merged with Merck. They're based out of Switzerland.
Renamed Merck Serono S.A.: Private Company - Merck Serono is known as EMD Serono.
What aviation company has a white cross? Swiss Air.
https://skytraxratings.com/wp-content/uploads/2017/07/Swiss_A320_1-984x554.jpg
Looks a lot like the X, doesn't it?
Not sure if it's related, but further south there is another, less well kept mansion:
https://www.google.com/maps/d/u/0/viewer?mid=1qB9aTtRTkQTDjNEaBTKYI_uLcODYHRbH&ll=31.54778007118473%2C-111.5854633012234&z=20
They have a tennis court:
https://www.google.com/maps/d/u/0/viewer?mid=1qB9aTtRTkQTDjNEaBTKYI_uLcODYHRbH&ll=31.548808670855788%2C-111.58572481660235&z=20
And a helicopter:
https://www.google.com/maps/d/u/0/viewer?mid=1qB9aTtRTkQTDjNEaBTKYI_uLcODYHRbH&ll=31.54859723740609%2C-111.5847243526398&z=20