Apparently, they decided that having the world's largest stadium wasn't enough so they decided to make it it's own city According the website of the designers (Marks Barfield, the designers of the london eye and Berlin's olympic bid) The price tag? 10 billion Saudi Riyals. That's about 2.6 billion United States dollars. Now I know that seems like a lot but for the amount of stuff we're getting it seems like a fair deal. The only detail missing? How many seats are in the damn stadium.