I've been fortunate to run into three different sports arenas.  I've run the Soldier Field 10 miler three years in a row.  Each time we finish on the 50 yard line inside the stadium.

In 2012 I ran the Home Run Charity race that finished along the warning track inside U.S. Cellular Field.  

This year I ran the Race to Wrigley.  Although we simply ran and finished outside the stadium this year is the 100th anniversary of the ball park so that was cool.