Scene at the Organ Pipe Cactus National Monument, a 517-square-mile reserve that shares a border between Arizona's Yuma County and the Mexican state of Sonora. The park is the only place in ...

Scene at the Organ Pipe Cactus National Monument, a 517-square-mile reserve that shares a border between Arizona's Yuma County and the Mexican state of Sonora. The park is the only place in ...

A single saguaro cactus is silhouetted against the sky at sunset at the Organ Pipe Cactus National Monument, a 517-square-mile reserve that shares a border between Arizona's Yuma County and the Mexican ...

Cactus scene: a classic organ pipe variety cactus, with its upward-spreading, asparagus-looking stems, at the Organ Pipe Cactus National Monument, a 517-square-mile reserve that shares a border between Arizona's Yuma County and ...

Saguaro cactus scene at the Organ Pipe Cactus National Monument, a 517-square-mile reserve that shares a border between Arizona's Yuma County and the Mexican state of Sonora

Saguaro cactus scene at the Organ Pipe Cactus National Monument, a 517-square-mile reserve that shares a border between Arizona's Yuma County and the Mexican state of Sonora

Saguaro cactus scene at the Organ Pipe Cactus National Monument, a 517-square-mile reserve that shares a border between Arizona's Yuma County and the Mexican state of Sonora

Clumps of spear-like cacti that give the park its name are scattered throughout -- occasionally in greater concentration -- within Organ Pipe Cactus National Monument, a 517-square-mile reserve that shares a border ...

Scene at the Organ Pipe Cactus National Monument, a 517-square-mile reserve that shares a border between Arizona's Yuma County and the Mexican state of Sonora. The cactus on the left (foreground) is ...

Scene at the Organ Pipe Cactus National Monument, a 517-square-mile reserve that shares a border between Arizona's Yuma County and the Mexican state of Sonora. The organ pipe variety in this image ...

Saguaro cactus scene at the Organ Pipe Cactus National Monument, a 517-square-mile reserve that shares a border between Arizona's Yuma County and the Mexican state of Sonora

Scene at the Organ Pipe Cactus National Monument, a 517-square-mile reserve that shares a border between Arizona's Yuma County and the Mexican state of Sonora. The park is the only place in ...

Scene at the Organ Pipe Cactus National Monument, a 517-square-mile reserve that shares a border between Arizona's Yuma County and the Mexican state of Sonora. The park is the only place in ...

Clumps of spear-like cacti that give the park its name are scattered throughout -- occasionally in greater concentration -- within Organ Pipe Cactus National Monument, a 517-square-mile reserve that shares a border ...

Clumps of spear-like cacti that give the park its name are scattered throughout -- occasionally in greater concentration -- within Organ Pipe Cactus National Monument, a 517-square-mile reserve that shares a border ...

Scene at the Organ Pipe Cactus National Monument, a 517-square-mile reserve that shares a border between Arizona's Yuma County and the Mexican state of Sonora. The park is the only place in ...

The saguaro cactus, native to southern Arizona (and a bit of neighoring Mexico and California) is legendary for its uplifted "arms." But as this image, taken in the Sonoran Desert near Marana, ...

The saguaro cactus, native to southern Arizona (and a bit of neighoring Mexico and California) is legendary for its uplifted "arms." But as this image, taken in the Sonoran Desert near Marana, ...

The saguaro cactus, native to southern Arizona (and a bit of neighoring Mexico and California) is legendary for its uplifted "arms." But as this image, taken in the Sonoran Desert near Marana, ...

The saguaro cactus, native to southern Arizona (and a bit of neighoring Mexico and California) is legendary for its uplifted "arms." But as this image, taken in the Sonoran Desert near Marana, ...

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