First and foremost, congratulations!
I suspect you already know this, and I mention it not to rain on your major accomplishment but to simply state the truth: you don't actually "own" your home as long as you are required to pay rent in the form of property taxes. Stop those payments and see just how long you are allowed to live there.
I am assuming you don't have allodial title, that being a true and accurate title of sovereign ownership which is long gone in the U.S.. I'm not an expert when it comes to real estate, but I'm sure in the mountain of paperwork supporting who owns your home, there is legalese similar in form to titles for automobiles, that being you get a "certificate of title", not an actual title.
The actual title for vehicles is called a Manufacturer's Statement of Origin (MSO) which is sent to the State, who then issues a Certificate of Title to the buyer when payment in full is made. It is extremely difficult for buyers to obtain the MSO, but it has been done. There may be legislation requiring manufacturers to send MSOs only to the State now.
Being debt free is an huge accomplishment that shouldn't be minimized. You know first hand how important financial independence is, and that's a great lesson to pass along to your children. I managed to buy my home and am "debt free" also some years ago. I am under no illusions about who is in control of this property. Legalities can change, there is no absolutes in that realm. Let that not keep you from exercising your personal power to withstand your natural rights to what you've earned. It may not always be easy, but resistance is NOT futile!
Well said! Reminds me of an argument I saw on @larkenrose's Facebook wall just this morning. Technically, you are correct in that the "human farmers" of government do lay claim to everything within their geographic borders and we all pay rent to them as debt slaves known as "citizens" but the other side of the coin is also true:
Authority is an illusion.
Their claims of ownership are invalid and unjust. I pay because of the threat of violence against me, but I still advocate for a future which has no imaginary borders and individuals can own and improve their own property directly without a nanny state getting involved. The more people who free themselves from mortgage debt, the more people will ask, "What am I getting for this tax payment I have to make? More drone wars? This is ridiculous."
I'm all for voluntary payments to improve my community and if I am going to have theft taking place against me, a land tax in Georgian model doesn't seem all that terrible... but it's still theft. We'll get there some day, even if it's my children's children's children.