The bust of Franklin. According to Wikipedia, it is made with "bronze and covered it with casts of 1,000 keys collected from local schoolchildren. Called Keys To Community, the one-ton sculpture also contains several brass nameplates representing Philadelphia firefighters fallen in the line of duty over four centuries. The sculpture was partially funded by the Fire Department and by more than 1.5 million pennies donated by schoolchildren in 500 area schools. It was unveiled and dedicated on October 5, 2007."