From your comment I can only surmise that you, sir, are high on drugs .
The United States was once a vast wilderness of forest, mountain and meadow. The indians here did little or nothing to develop it, and in fact their nomadic existence was oftentimes a mandatory act of survival due to their utter, irresponsible depletion of resources in a given area.
The Hagia Sophia is a beautiful work of art devoted to the glory of a Christian God. It took a lot of time, effort, and willpower to create. To compare the two is apples and oranges.
And I know you're not high on drugs, it's way too early for that. I apologize.
The Alhambra is a beautiful work of art devoted to the glory of an Islamic God. It took a lot of time, effort and willpower to create. Should al-Andalus be returned to the Caliphate? After all, before the Muslims, Spain was a vast wilderness of forest, mountain and meadow, ruled by backwards, feuding bands of Visigoth barbarians.
Note that I'm not seriously suggesting that Spain be returned to Islamic rule, but I am saying that when you start with this line of thinking, there's no limit to the lunacy you get yourself into.
A more appropriate comparison would be to propose the return of the mosque at Cordoba (now a Christian cathedral) to the Moslems. (The Alhambra, mentioned here several times, isn't a very good comparison because the Alhambra was not a religious edifice in the first place.)
Or the return of the Great Synagogue in Toledo, also now a Christian church, to Jewish worship.
Or for that matter, the return of all the pre-Reformation churches and cathedrals in England and Scotland to the Roman Catholic Church.
None of this is going to happen. History is history.
Vast stretches of North and South America were converted over to agriculture, and many different writing systems were invented. You can find remains of their civilizations in many different places.