Part 8/10:

Yet, beneath the surface, the city’s operations bleed into tunnels less glamorous but essential. The river systems utilized for sewer functions intertwine with historic waterways, blending ecological history with urban development.

The Subway System: A Network of Abandonment and Innovation

Philadelphia's subway system, which dates back to the early 20th century, exemplifies modern urban engineering. While the system has expanded, it also hosts a plethora of unfinished tunnels and abandoned stations, a forgotten infrastructure lurking beneath the surface that entices urban explorers.