Number of spectators
I took a look at a number of spectators list the other day. Non-surprisingly Borussia Dortmund top the list, with Manchester United and FC Barcelona as closest runners up. At top ten there are six German teams.
However, one thing surprised me a lot. Allianz-Arena (FC Bayern Munich) has a capacity of 69000 and an average of 69053. How is that possible? In fact, six clubs has a higher average than capacity. I believe that they have played one or several home-games at another arena.