Peru
There is hardly anything more spectacular than mountains. I don't know what's up with the air in the mountains, but I always feel so much more relaxed, calm and free in mountains. It's like my mind just stops for a second, clears all the fear and uncertainty, and focuses on whatever is important.
I had a rule while staying in mountains:
If I needed to answer myself some questions, I would just hike the highest mountain alone and let the right thoughts come to my mind. It always worked.