Retractable roof stadiums Retractable roof stadiums should not be included in this list because it is a list of indoor arenas Indoor arenas are buildings with a fixed roof There is a number of retractable roof stadiums in Europe apart of the two currently listed and if there will be more appearing in this article the indoor arenas will be in the bottom of the list This has a logic since stadiums are usually larger by capacity If there are no objections I will remove stadiums from the list