There's a hidden button in the salt flats located in the Koani province. This video shows what will happen if you decide to push the button.
As far as I know, this is the only button or thing like this so far but I will be on the lookout for more in case there's something special about these. Feel free to let me know if any of you happen to find another one of these as well.
![](https://s2.save4k.ru/pic/Afi2Z7LgP90/maxresdefault.jpg)