Football stadiums come in all shapes and sizes, so how do we decide which ones look best? Many factors need to be considered: the landscape, the tripod, the atmosphere and the most elusive of features, a wow factor.Below are 30 arenas that meet these criteria, ranked by their beauty. Enjoy. Mané Garrincha opened in 1974 | SERGIO LIMA / Getty ImagesMane Garrincha is named after the legendary Brazilian and is a real gladiator arena.Seemingly held together by a series of concrete matches, it is architecturally fascinating.We…