One of Idaho's secret treasures, this massive chasm '1300 ft wide and, in places, 800 ft deep' stretches across the high desert for 67 miles. Stand at the overlook and you look down over a huge void of dark rock, sparse vegetation clinging onto sheer walls and a cold, boulder-strewn river the color of steel far below.
If you go:
Getting to Bruneau Canyon Overlook involves an 18 mile drive up a road that's half paved, half loose gravel, passes through a USAF bombing range and finishing with a mile or so of dirt track, but it's worth it. Look out for wildlife living in and around the canyon including bighorn sheep, antelope and coyotes.
Links:

Hot Springs Road
Hot Springs, Idaho 83246 USA
Mailing address:
BLM Bruneau Field Office
3948 Development Avenue
Boise, ID 83705
Phone Numbers:
BLM Field Office
+1 (208) 384-3300
+1 (208) 384-3300