Most refined app of this type I have found, but...

It would be nice to be able to choose my own colors, from categories. For exemple:
- countries visited (in green)
- countries went through (e.g. airport stop) (in yellow)
- countries planned to go to. (In blue)
- countries "wishful thinking"
- countries "no way, ever"
- etc...

That would make a lot of sense for someone travelling a lot (bloggers, retired, etc...)

Being-Present about Mark O'Travel: Where I've Been, v2.5