1515. The Montezuma Castle National Monument
The Montezuma Castle National Monument can be found under an hour south of Sedona. The 20 rooms here were constructed of stone and mud. Oddly some online sources indicate that It was named in tribute to the legendary Aztec Emperor who reportedly was not even born when the buildings were erected.
(No doubt the original residents called it something else.) The Sinagua people resided here between the 1100s and 1400s. It is said to be the best-preserved place of its kind in the area. It is only a short hike to get to the site.