Book excerpt: The massive steel mills of Youngstown once fueled the economic boom of the Mahoning Valley. Movie patrons took in the latest flick at the ornate Paramount Theater, and mob bosses dressed to the nines for supper at the Colonial House. In 1977, the Youngstown Sheet and Tube Company announced the closure of its steelworks in a nearby city. The fallout of the ensuing mill shutdowns erased many of the city's beloved landmarks and neighborhoods. Students hurrying across a crowded campus tread on the foundations of the Elms Ballroom, where Duke Ellington once brought down the house. On the lower eastside, only broken buildings and the long-silent stacks of Republic Rubber remain. Urban explorer and historian Sean T. Posey navigates a disappearing cityscape to reveal a lost era of Youngstown.