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!

Index:
0:00 - Introduction to the Philadelphia underground concourses
0:48 - History of Philadelphia’s street cars and subway construction
2:36 - The history of expanding Philadelphia’s underground concourses
3:10 - The history of “The Gallery” (Philadelphia’s 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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