Centennial Plaza was designed as part of the City of Peoria’s celebration of the State Centennial through a two-stage design competition for the remaining parcel within the City Hall complex. The plaza features a Decades Walk that celebrates national, state and city milestones, event plaza, lawn, and a covered amphitheater. International, national, state and city of Peoria historical events and milestones are displayed on tiles which are embedded in the walkway that encircles the plaza.