The key is .. “Other needful buildings,” which obviously presumes that the federal leviathan will ONLY ACQUIRE LAND THAT IT MUST HAVE TO FULFILL ITS CONSTITUTIONAL DUTIES. Any other acquisitions should be seen as HOSTILE TO THE STATES. In fact, that is exactly what has materialized, proving the wisdom of the Framers.
And, among other things, that leaves National Parks outside constitutional authorization and any unconstitutional act by the feds is by definition an act of tyranny. National Parks are, therefore, acts of tyranny and should be repossessed by the states and the individual owners right away.