0
An antiworld is a hypothetical world constructed from antimatter.
I don't know who constructed the obelisk because you are not asking specifically WHICH obelisk. There are many obelisks in the world to choose from.
India
No Lego park is completely constructed of Lego, however Legolands all over the world have millions of Lego bricks in them!
It was constructed for the world fair which was held in Paris. It was considered a engineering marvel at the time, and thus a Wonder of the World.