The renowned Philadelphia artist and sign painter Stephen Powers, who many know by his old tag name ESPO, is putting the finishing touches on a piece of monumental street art on the outside of an old Macy's parking garage in downtown Brooklyn.

The Richard Hambleton retrospective at Phillips de Pury & Company is only on view through Tuesday. But there's still plenty of historic graffiti around town to cast your eye over. With the help of graffiti aficionada Katherine Lorimer (who snaps shots of street art as Luna Park), WNYC has created a tour of five of the coolest and oldest pieces of graffiti around town.