Quinoa, Thank you for your guidance, this Spanish art work is also located in a "frustratingly civilized location".Remote is very important, especially to dig something. Better yet you own it, or make a deal with landowner.
However, several of the most incredible spots I know of, can be seen from the main drag in the town I live in. I've hiked up to them, watch them about every day of the year, these places are in locations that are fairly easy to get to as well, a short hike up the hills. Mostly due to ancient travel routes that are now modern travel routes. The best travel routes never change thru time. You might be surprised what is close by to where you live. I certainly have been.
I know of a very huge spot you can actually see from a Walmart parking lot. That's how ridiculous it is knowing about it. It makes me sick not being able to do much on it and a few others.. But I keep waiting, thinking something will come along and allow it. Maybe I'm wrong that it will. That's why I press on to many different sites and not stick with any particular one.