Please note: there is a more-recent map-and-post on this subject; click on the following…
Highest-drawing football clubs in Europe (UEFA domestic leagues), for 2015-16 or 2015 seasons: all clubs (75 clubs) which drew over 25 K per game (home matches in domestic season).
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52 Highest drawing football clubs in Europe, 2009-10 season
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Thanks to Bing.com/maps [Bird's Eye view] (link goes to Barcelona/Camp Nou photo)
Thanks to Spain Ticket Bureau.com (Dortmund/Signal Iduna Park photo).
Thanks to webrealmadrid.com (Real Madrid/Estadio Santiago Bernebéu photo).
Thanks to ManUtdPics.com , (Manchester United/Old Trafford photo).
Thanks to Maximilian Dörrbecker at de.wikipedia.org (Bayern Munich/Alliananz Arena photo).
Thanks to www.arenapark.gelsenkirchen.de (Schalke 04/Veltins-Arena photo).
Thanks to Byrne Group, byrnegroup.co.uk (Arsenal/Emirates Stadium photo).
Thanks to ZeroZeroFootball.com (Internazionale/Stadio Giusseppe Meazza [aka San Siro] photo).
Thanks to Projets-Architecte-Urbanisme.fr (Olympique Marseille/Stade Velodrome photo).
Thanks to European Football Statistics site, for attendance figures, here.