Curiosity is often a sin. For example, you don't need to see the person lying on the side of the road being attended to by first responders. It is none of your business. Use the golden rule: Would you want people staring at you if you were in that condition?
You should be ignorant about what is in the realm of others' privacy. There is no need to know, so you should not know. One's medical history should not be public knowledge. "Thou shalt not covet anything of thy neighbor's (that you don't need to know)." But with the cell camera, the internet, UTube, and more, privacy is harder to preserve. Of course, no one can hide from God, but that is a different matter. Only God can know everything virtuously. See Psalm 139.
It is likewise not virtuous to make known or to know unflattering, but irrelevant, things about others. That is the realm of gossip, a serious sin in the New Testament. Think of how much of American popular culture feeds on and starves without gossip? What dysfunctional, idiotic, or criminal things have Brittany, Paris, etc., ad nauseum, done now? You shouldn't want to know. You may know too much. Try to forget. Make more room for virtuous knowledge.
I could go on, but please add to my categories and give specifics.