-Thanks for your question. Episode 3 (which was released this week) dives into the story of Joe Frazier, in and out of the Rocky films. We looked at his cameo in Rocky I, told the story of how he was almost cast as the co-star in Rocky III, and then spent time looking at places he is remembered in the city.
The gym is an important place. We spoke to Brent Leggs from the National Trust, who was behind the building getting its historic designation. You can also check out a companion doc from WHYY Digital Studios on Frazier.
-Boxing in Philly runs deep! The Rocky story tapped that backstory and expanded it. One of the best places to learn about boxing in the city is Boxers' Trail in Fairmount Park.