Took a trip up there recently and was blown away by the designs of this place.
Built around 1100-1400 AD by the Sinagua people. This five-story and 20-room castle built in a cave was used for shelter. Ironically, the place’s name isn’t even related to the people who lived in it. The name was given back in 1867 by the early settlers who believed it was Aztecs.
The castle is about 90 feet high and was built inside a cave in the Camp Verde area of Arizona. Access through the castle was through ladders that were probably raised or lowered through trap doors in the ceiling to prevent enemy advances or access. One of the main reasons the Sinagua chose to build the Castle so far above the ground was to escape the threat of natural disaster in the form of the annual flooding of Beaver Creek. At the time, water was pretty frequent in those areas, and during the Monsoon season, the creeks would build up and flood the nearby areas.
The dwellings and the surrounding area were declared a U.S. National Monument on December 8, 1906, due to the American Antiquities Act signed [1] earlier that year. It is one of the four original sites designated as National Monuments by President Theodore Roosevelt. Montezuma Castle was added to the National Register of Historic Places on October 15, 1966
Links are posted below for anyone who would like to read more.
https://en.wikipedia.org/wiki/Montezuma_Castle_National_Monument
Throughtful Reader 
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