What is your most vivid memory of nature?

It was about 14 years ago when I was in Posadas, Argentina for 2 weeks.  We took a seven or eight-hour bus ride to see the Catarata de Iguazu.  There I was standing in front of the biggest waterfall of Iguazu- G. Diablo.  I remember standing a few yards from the waterfall, feeling its spray like misty rain on a warm sunny afternoon.  The spray almost turned like clouds below me that I could not see the bottom of the waterfall.  Huge amount of water was coming down from up above and falling right in front of me!  It was so awesome and huge, its sound so overwhelming and deafening that it sent shivers all over my body and altered my breath and heartbeat.  It was such a great and humbling experience that I could not help but break into song and tears.  I have seen many quiet beauty of nature, but nothing that turned me trembling as this one did!