Background: Renowned Spanish architect Santiago Calatrava designed this cantilever spar cable-stayed bridge to be made from a combination of steel, glass and granite. Completed in 2004, the pedestrian bridge crosses the Sacramento River in the Turtle Bay Exploration Park.Why It’s Innovative: As its name implies, the bridge’s 217-foot-tall support tower acts as a giant sundial. The deck of this pedestrian bridge is made from nonskid glass panels to give walkers a greater sense of the river. MacDonald notes that the deck’s truss bears the bulk of the bridge’s load, while the cables appear slack compared with those of other bridges. (Source)