In a post I started last week asking how you would define must-see, the general consensus was that it is a personal thing, as everyone doesn't have the same interests or tastes. But what about important-to-see? I don't mean important to you in terms of completing your bucket list, but something that is important to your personal growth as a citizen of the world, even if you don't know it yet. Of everything I've seen so far, Oradour-sur-Glane in France comes closest. My eyes were opened to just how evil humans could be. My wife was so shaken that she never wants to go to a place like that again, but the site had a desired result as she does talk about it.
Guidebooks generally give rankings of must-see, maybe-see, and so on, but they don't tend to go into philosophical detail of why it's important to see something. How about something that won't disturb you. Is something beautiful such as Michaelangelo's David a must-see, or can a case be made that a significant piece of art like that transcends beyond typical rankings? Even if art isn't your thing, is it important to visit David? Are there must-see things that go beyond personal taste and interest that should be ranked as important-to-see?