People have been living in the downtown area of Tucson, Arizona for at least 4,500 years. The greater Santa Cruz river valley has been occupied by humans for 12,000 years.
That's not a river. That's the South Canal in Mesa, Arizona (Phoenix metro area).
This is a view of the East and South canals. At least half of all the Phoenix metro canals were originally built by the Hohokam (from roughly 200-1400 CE), and are still in use (restored) today.
Phoenix, Arizona actually has more miles (kilometers) of Canals total than both Venice and Amsterdam. No, really. Phoenix has about 180 miles of canals, many of which are built on ancient canal foundations.
below is an aerial view photo taken in the late 1930's of one branch of Phoenix's canal systems:
Also have the "Montezuma Castle," if you need a castle:
I don't need to look at some 12th century European castle to see age.