This is the song from Nat Geo Adventure's Departures Promo. I didn't find the promo video, but i did find this. This song called Secrets by Alexa Woodward. It is very soothing, but somehow had a positive energy. Like it very much. And I love watching Departures series, if only I had a best friend that I can take to travel across the globe with like that.
For now, I just enjoy the series and the song. Hope you'll enjoy it as much as I do. :)