Organ Pipe Cactus National Monument is the only place in the United States where the organ pipe cactus grows wild. The park is located in Southern Arizona on the Mexico border. It was declared a UNESCO biosphere reserve in 1976.
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Organ Pipe Cactus National Monument is the only place in the United States where the organ pipe cactus grows wild. The park is located in Southern Arizona on the Mexico border. It was declared a UNESCO biosphere reserve in 1976.