I took a ride out to Goodyear to check out the old Phoenix Trotting Park. I’ve always been fascinated by this site. There are some interesting YouTube videos from crazy people who have ventured inside. Here are a couple https://www.youtube.com/watch?v=9cQrSrv-KKE https://www.youtube.com/watch?v=-C53gUXcIXw Also, check out the wikipedia page for the brief history of this unique structure. http://en.wikipedia.org/wiki/Phoenix_Trotting_Park