Organ Pipe National Monument
Organ Pipe National Monument is directly on the Mexican border. It's remote and undeveloped and mostly closed due to the danger of illegal immigrants.
We were just there to maintain some hiking trails, but we were also there just in time to see the desert bloom a deep green that only happens after wet winters. Even then, the verdant spring of blooming ocotillo and teddy bear cholla only lasts a few short weeks.