Now, Popp has embarked on a new bi-monthly web series called Uncover Philly, which will tap into the lesser-known wonders scattered around -- and in the case of his first installment, under -- the city of Philadelphia.
Episode One takes us into the Reading Viaduct Tunnel, a 1.5 mile underground network that was previously used to ship freight out of the city. Built in 1893, the tunnel runs diagonally from 27th and Pennsylvania Ave. to 21st and Hamilton, intermittently continuing to Broad Street. It was last used in 1992 and has since had its tracks pulled up, but Popp shows how the underground space can still have a powerful effect on visitors.
Check out the first episode below and subscribe here for future episodes of Uncover Philly.