Our GPS coordinates take us back to the "City of Brotherly Love" this week for a fond, first-person reminiscence of Philadelphia's legendary Spectrum - with one of its chief managerial architects, Lou Scheinfeld ("Blades, Bands and Ballers: How 'Flash and Cash' Rescued the Flyers and Created Philadelphia’s Greatest Showplace"). A state-of-the-art indoor sports and events mecca upon its opening in September of 1967, the facility dubbed "America's Showplace" was Philly's first ​true ​modern indoor arena - built ​quickly (in roughly a year) and specifically for the city's new NHL expansion franchise (the Flyers) - one that Scheinfeld and NFL Eagles co-owners Ed Snider, Jerry Wolman and Earl Foreman helped originally secure.   The Spectrum was an instant hit for the freshman Flyers - and for the defending NBA champion 76ers, who also joined the tenant roster that first year - as well as the darling of top rock artists and concert promoters, immediately enamored with the facility's surprisingly top-notch acoustics.   And of course, a bevy of forgotten sports events and franchises that we love to obsess about, including some of our all-time favorites: the NASL's Philadelphia Atoms 1974 indoor exhibitions with the Soviet Red Army team that eventually launched the MISL and its Philadelphia Fever in 1978; the multi-league indoor lacrosse Wings; Billie Jean King's WTT Philadelphia Freedoms; the Bulldogs of the mid-90s' Roller hockey International; and much more.