I was once told of the importance of always looking through open doors and gates. This was in relation to Paris and peeking into all those hidden courtyards off the main thoroughfares, tiny worlds of their own, each looked over by apartment after apartment, generation after generation, peeking whenever they were open, whenever you could see this hidden world.
I did not really need this lesson—I have been looking through doors and gates for as long as I remember, but it was good to know other people also appreciated this, understood, and wanted to share the importance.