We once camped at the bottom of Mariscal Canyon on the Rio Grande in Big Bend national Park. At that point, the canyon is 1400 ft deep, with sheer cliffs on either side of the river.
The result is a restricted "slot" view of the heavens, with the stars being especially bright due to the high clear air and the absence of light pollution. Under these conditions, the "movement" of the stars is quite apparent.
Peregrine falcons also nest in the canyon walls at this point. To hear their eerie "skree" echo in the canyon is a memorable experience.
AHHhhh...
up on the Canadian border around Wisconsin is good; too.
The sounds of the loons hooting is haunting.