Some random thoughts:
Nothing material is truly priceless. You may think that maybe a human life is priceless, or a culture’s history, but it’s not. People can put a price on anything. Ransoms, hits, selling artifacts on the black market. There's always some odd billionaire out there who'd buy old nick-nacks. The only priceless things there could be are emotions, memories, thoughts- things like that. So, yeah, that may be a priceless artifact, but some billionaire will put the right price tag on it.

There's a feeling I've had, I think it's a sort of adventure feeling. It's a tightness in your stomache, like your parents just left the house, your alone wondering what you want to do while walking around the empty house. Another time I get that feeling is very weird. When I over-hear people you wouldn't expect to be talking bad about you doing just that. I also get home-sick when that happens though, because at least at home, if someones going to talk about me in a bad way, they do it jokingly in front of me, or knowing it's within ear-shot, to make sure I hear; it's all in good fun.