No. We do crash tests from time to time [1]. But at a minimum, you must control--not even just own--the terrain you're crashing into. (It's also not solely a Part 91/FAA matter. The EPA, for example, would also want to have a say.)
[1] https://en.wikipedia.org/wiki/2012_Boeing_727_crash_experime...
The site in Mexico was chosen because authorities in the United States would not allow the test to take place.
I have an intuitive sense of what you're pointing at with the Boeing 727 crash experiment, but how does the law phrase it?
"The power to govern, manage, direct, or oversee something" [1]. So if I own/possess acres of unfenced grasslands, I'd need to put up fences or people to monitor the property or at the very least crash site's borders.
If you want to crash a plane, you'd likely have to apply for/receive temporary flight restrictions over the area where you want to crash it so that ATC can ensure everyone else stays clear.
https://www.faa.gov/air_traffic/publications/atpubs/foa_html...
Correct. I was simply talking about control of the land underneath. Owning and controlling the land doesn't mean you have any rights to its airspace.