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Organ Pipe Cactus National Monument - Arizona

As a UNESCO Biosphere Reserve bordering the Mexican state of Sonora, Organ Pipe Cactus National Monument is home to a stunning display of over 2,000 plant species. It is a U.S. national monument known for its bountiful collection of cacti and is the only place where the senita and organ pipe cactus grow naturally. In this region, it’s not the natural world that poses significant risks to your health and safety—it’s the location. Much of it was even closed off to the public between 2003 and 2014 due to trafficking organizations.

Shutterstock/David Buzzard

The monument is considered one of the most dangerous national parks in the United States due to its history with smuggling, cartel groups, and violence. Visitors should approach this area with the utmost caution.