Marshall can be explored by using a free QR code reader app that can be downloaded onto your smartphone. QR Codes are located on 20 planter table tops located along the downtown blocks of Michigan Avenue, in Carver Park, and by the doors to City Hall.
QR Codes can also be found in front of the Honolulu House, at the Brooks Memorial Fountain and the G.A.R. Memorial Hall building as part of the TAG Calhoun program.