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The Mesa Grande ruins, just west of the nine-story hospital, date to about A.D. 1300. They are listed on the National Register of Historic Places, but are also on the Arizona Preservation Foundation's list of most endangered historical places. Wilson said Mesa Grande is one of three major Hohokam ruins. The others are Pueblo Grande in Phoenix and the Casa Grande Ruins National Monument in Coolidge. "I think it was a natural partnership for us to develop with the museum," said Susan Gordon, a Banner Mesa spokeswoman. "We have a great view of the ruins." It's unclear how long the observation center will remain open. Banner Health announced more than a year ago the facility would be phased out as the new Banner Gateway opens in Gilbert. [Photo source: Banner Health.]