This is a shot taken near the Red Cathedral in Death Valley National Park.
Playing in this spot was one of the coolest things I've ever done - each note I played created an echo that would come back to me a few seconds later. It truly felt as if there was another person answering each of my calls just beyond the next canyon. Can't wait to get back here to do some serious recording!
Below is a clip of my experimentation with the echoes here. With the low audio quality, it is difficult to hear the echo, but if you listen very carefully you can hear them on some of the higher notes.