If you start at Suburban Station (16th St and JFK Blvd) or 30th Street Station (2955 Market St), drop $2.50 to jump on the Market–Frankford El and ride it westbound. This rolling perch provides killer views of Stephen “ESPO” Powers’s “A Love Letter for You,” (muralarts.org), a series of 50 elevated murals between the 46th and 63rd Street stops. (Though he’s now based in Brooklyn, graffiti writer turned Fulbright scholar ESPO (which stands for Exterior Surface Painting Outreach) is a West Philly native.) Playing with the precepts of classic commercial art, the works ruminate on the expression of love. Seen together, they form a beautiful urban valentine.