The national monuments of Wupatki, Walnut Canyon, and Montezuma's Castle showcase the treasures of the first people who settled and developed farms, towns, and trade routes throughout northern Arizona and beyond. The Hopis call these ancient peoples Hisat'sinom, and Spanish explorers named their hard, arid homeland the sierra sin agua, mountains without water. Indeed, much of the region receives less annual precipitation than the quintessential desert city of Tucson. In Hisat'sinom: Ancient Peoples in a Land without Water, archaeologists explain how the people of this region flourished despite living in a place with very little water and extremes of heat and cold.