Notre Dame worth tons of resources by simply reducing the cost of the hundreds of the research and upgrades on the way.
Collosseum and Forbidden City are for defense purposes where Forbibidden City is more toward end game, and Collosseum is more mid game centric
Terra Cota Army I'm not sure.
And last but not least, it's not just the utility, it's also the aesthetics, pick one u like the most. E.g. you will never have the beauty of hanging garden or the greatness of the pyramid if u just blindly go acropolis, right?