In Camp Verde, Arizona.
A look at Montezuma’s Castle, a community carved in a cliff not far from Sedona.
Though it’s called a “castle,” it is actually more like a 5-story apartment complex constructed over generations beginning in the early 12th century and occupied, apparently, until around 1425.
Built about 90 feet up the cliff wall by the Sinagua people, the high-up location protected them from both the flooding of the Beaver Creek below and from invasion by enemies. Looks like it also did a great job of protecting them from the heat and sun too. Not only an amazing example of skillful design, engineering, and building, it’s a fantastic marvel of strategic thinking.