Organ Pipe Cactus National Monument
Lukeville, Arizona, United States
19 March, 2016
Situated on the US/Mexico Border, the Organ Pipe Cactus National Monument features some of the rarest cacti in the United States. Even in southern Arizona, winters prove to be too extreme for the highly cold-sensitive organ pipe cactus. Hop across the border into Mexico, though, and you will find them to be much more common.