Organ Pipe Cactus along the North Puerto Blanco Drive at Organ Pipe Cactus National Monument in southern Arizona, USA. In 1976 the monument was declared a Biosphere Reserve by UNESCO.
Giant Saguaro Cactus along the North Puerto Blanco Drive at Organ Pipe Cactus National Monument in southern Arizona
Saguaro cacti in front of the US / Mexican border fence along the South Puerto Blanco Drive in Organ Pipe Cactus National Monument, Arizona.
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