along the border is federally controlled. However, many sites within this region are considered sacred by the Tohono O'odham Nation. Important sites include Monument Hill, which is a ceremonial and historic battle site and burial ground; and Quitobaquito Springs, which is a local water source and the site of an annual salt pilgrimage. For this reason, construction was opposed by many locals, including Representative Raúl Grijalva and Tohono O’odham Nation Chairman Ned Norris, Jr., who testified before Congress on the matter. Customs and Border Protection officials maintained that no human remains or artifacts were discovered in the areas where explosives were used, and that Monument Hill was previously disturbed in 2010 when the existing border fence was installed. Climate Organ Pipe Cactus National Monument has a hot desert climate (Köppen: BWh) with very hot summers and mild winters. Gallery See also List of national monuments of the United States Bates Well Ranch, listed on the National Register of Historic Places within the park Dos Lomitas Ranch, also listed on the NRHP Growler Valley and Growler Mountains geographic features located within the park El Camino del Diablo historic road that traverses a section of the monument References External links Official Organ Pipe Cactus National Monument website – U.S. National Park Service 1937 establishments in Arizona Articles containing video clips Mexico–United States border Parks in Arizona Protected areas established in 1937 Protected areas of Pima County, Arizona Protected areas of the Sonoran Desert National Park Service National Monuments in Arizona