Nice video! For your tip on adding extended layovers, I would highly recommend Iceland Air. While booking your flight with them, you can add easily anywhere from 24 hours to several days of a layover. I did this recently and my “layover” in Iceland was one of the highlights of my trip!
It depends if you want to leave the airport. But it's a good point - if you have a stopover in a country, where you would need a visa, then you need one to go out. If you just have a connection though, you don't need a visa (at least it wasn't needed where I was)
