A place should be better for you being in it, because the opposite of that is just not acceptable, the opposite of making it better is of course that a place is worse for you having been there. Every thing you touch should be slightly better because you are there.
This is something that has shaped my whole career.
The underlying principle, of course, is to always be on the lookout for things to improve, and to do things that make it better for all, to be aware of what is around you and what can be done to make it better for everyone.
It doesn't have to be big.
As I walk though offices, I close copier lids, pick up paperclips off the ground, put some papers in theor proper place so they can be found later, help some poeple with questions.
On a larger scale, I redesign process layouts, create purchasing plans (I call them machines as I like them to run without me), I mentor others, talk to everyone on my team and other groups to insure that we as a team are going in the same direction and that we are all working on the same goals. It goes on and on as there are an infinite amount of ways to make things better.
Doing this, even on a small scale, not only makes you and your area better, but as a leader, you are setting the example to everyone around you about what matters, and they will do what you do. They will make sure they leave each area better for them being there as well.
Imagine a building full of people all trying to make each area better as they walk through it.
Now think bigger, and imagine a city, a state, country, or world doing the same.
Small positive actions build upon themselves until they change who you are, and what the world can be.