UEFA CL Round of 16 draw will be in Switzerland on 20 Dec. 2012, details here (uefa.com).
Update – Here is the 2012-13 UEFA CL Round of 16 draw,
‘Manchester United drawn against Real Madrid in Champions League last 16
• Arsenal to face Bayern Munich, Celtic play Juventus
• Barcelona to meet Milan in another eye-catching tie
• In pictures: the 16 qualifiers‘ (guardian.co.uk/football).
Thanks to european-football-statistics.co.uk, for 2011-12 attendance figures.
Thanks to soccerway.com, for current attendance figures.
Thanks to Roke at commons.wikimedia.org/wiki/File:BlankMap-Europe-v4.png, for the base-map.
Thanks to the contributors to the pages at en.wikipedia.org, ‘2012–13 UEFA Champions League‘.