In front of the "Little A'LE'INN" where you can get a decent bite to eat in Rachel, Nevada, just over the mountains from Area 51...

If you were to follow this dirt road a few miles, you would eventually reach a gate for Area 51... http://www.dreamlandresort.com/area51/gl_road_6.html

Desert, mountains and Joshua trees off of Nevada highway 375, near Area 51.