I think Tokyo also has an artifical island airport. Actually if you look at
Tokyo now compared to 100 years ago ALOT of land has been added around the harbor over time, its pretty amazing.
As for dubai, check out the
Burj Dubai, its gonna be 160+ stories last I checked, I think right now they are around the 90th story in construction, so in a few months it will be the tallest building on earth. And by the end it will be the tallest freestanding structure, even taller than the tallest radio towers!!