Per this list I have been fortunate to hear several. I have heard the very vocal Howler monkeys calling out at 4 A.M. in Costa Rica. I also heard the rumblings of Arenal Volcano while there.
I have heard the peaceful yet mesmerizing Muslim call to prayer while staying on the small islet of Layang Layang Malaysia.
While scuba diving in the Dominican Republic I heard the high pitched underwater symphony of the humpbacks off in the distance, just hearing your own breathing underwater is also a unique experience.
I have listened carefully to the splintering of ice as it crunched beneath my feet as I walked across the ancient glacier.
There are a few other sounds of travel that are memorable for me. The sound of molten hot lava crackle as it cools rolling down the side of a volcano in Guatemala cannot be forgotten. And the tinkling of the temple bells in Chiang Rai prompted me to buy a set for myself. The crashing of the waves off of the distant reef in Rarotonga makes me miss the salt air. The thunderous roar of water falling as you stand at the base of Niagara Falls is a reminder of the strength of nature.
Yet there are other sounds that hopefully everyone will someday hear and maybe be fortunate enough not to travel to do so. The sound of your grandchild call you your special name....Gaga, Mimi, Nana, Mema or whatever the first time is certainly one of the highlights of one’s life.
So don't just open your eyes to our amazing world, keep your ears peeled too.