Underground Philadelphia: From Caves and Canals to Tunnels and Transit

Explore Philadelphia's relationship with the underground, as old as the city itself, dating back to when Quaker settlers resided in caves alongside the Delaware River more than three hundred years ago.

Explore the city under the The City of Brotherly Love, which became a national and world leader in the delivery of water, gas, steam, and electricity during the industrial age. The construction of multiple subway lines within Center City took place during the early twentieth century. An intric...