Yesterday we visited the Casa Grande Ruins National Monument in Coolidge, AZ. The museum there and the ruins were extremely interesting. We are just amazed that over 1,000 years ago they had such knowledge of architecture and structural engineering. This site is the only place in the world that has an existing structure from that era made from caliche. They have built a roof over the "Big House" to protect it from the elements, but they are extremely worried about sinkholes causing it to shift. Before being designated a national monument, it was vandalized and neglected for many years.
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