Deep below the streets of Philadelphia is a labyrinth of hidden tunnels and corridors developed over nearly a century ago. What few people realise, is that some sections of tunnel have been abandoned through out their entire history!
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Index: 0:00 - Introduction to the Philadelphia underground concourses 0:48 - History of Philadelphias street cars and subway construction 2:36 - The history of expanding Philadelphias underground concourses 3:10 - The history of The Gallery (Philadelphias underground shopping-mall) 3:29 - Overview on the Philadelphias abandoned underground concourses 4:10 - Crime surge in Philadelphia / further abandonment of the underground concourses 4:54 - Philadelphia abandoned Arch street tunnel / concourse 5:57 - The history of Philadelphia graffiti art 6:53 - The further of Philadelphia underground concourses
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