Cool, but where's the gift shop?

You've got to me kidding me? You haven't even been here for 30s yet and you want to buy a key ring of the place? The best 2 words of advice I think I can give you are 'go home' and if I can add a 3rd, stick 'now' on the end.

As for the Colosseum, 2 words for it are 'simply awesome' with the third in this case being 'still'.