Something that will set apart your world would be a rocket. How many times have you seen a rocket in a Minecraft server? At least me, not many.
If you build a rocket with its launcher like the image in this post, we guarantee you it will grab attention, specially if it’s placed in an area where maybe in the real world it wouldn’t be.
But, if you are building a sort of military base or the new offices for Space X, then having a rocket is a must. You can take inspiration from this rocket and get it going. Hopefully your first attempt would be better than Musk’s lol