MMMHhhh..
I think there are two mistakes.
First one: colosseum must go in ancient world as is not medieval by definiton

Second one: Stonehenge MUST go in ancient world if somewhere.

My suggestions: Put Tzitzen Itza or Machu Pichu in medieval wonders.
Also put Internet in modern (as i think that it is greater than for example CN Tower). Eiffer tower and Marrakech Koutoubya also must appear somewhere... I'll think about that, but i see that is a very eurocentrist (maybe usacentrist) list of wonders.