Mod which hides boss spawns until you stumble across them?

Does anyone know of a mod which hides the location of boss spawns? I think it would be fun to stumble across boss locations instead of getting it put on the map for you. Just like when you find the trader in your seed.

Edit: Thanks for the replies, I am aware I can not click the stones but wasn't quite what I was after because of accidental clicks etc or mistaking it for a lore type stone.