This concept was proposed in 1965 for a dual football/baseball stadium
in Philadelphia. The stadium was slated to be 60,570 for baseball and
72,599 for football and located at the Veterans Stadium site. A concept
for a domed version of the stadium was floated as well. The translucent 
dome would have caused completion to move from 1967 to 1968, but 
would have made it a year round facility with air conditioning.

2012 Eric Okurowski