If you have the deed to a piece of land that’s (usually, in stable-ish jurisdictions) backed by the police and ultimately, military, of the government. You can

If you have the deed to a piece of land that’s (usually, in stable-ish jurisdictions) backed by the police and ultimately, military, of the government. You can stand on it, build on it, possible mine it, and the cops will stop anyone from interfering.