Saguaro

Declared in 1994 over an earlier national monument, Saguaro protects the largest saguaro cactus forest in the world, an extraordinarily slow-growing species that can live more than 150 years and typically does not put out its first side arm until it is 75, so the many-armed specimens that dominate the park's landscape are in fact more than a century old. The cactus is a sacred symbol to the Tohono O'odham people, whose ancestral land surrounds the park.