Background: Leonardo Da Vinci sketched plans for this bridge in 1502 for Sultan Bajazet II of Constantinople, but it wasn't until 500 years later that the design was brought to life by Norweigan artist Vebjørn Sand. The pedestrian bridge opened in 2001 and crosses the E18 highway.
Why It's Innovative: For centuries it was thought that Da Vinci's sketch of the bridge was implausible. The bowed arches of the single-span design are dramatically thin where they connect with the walkway, but they flare out as they approach the ground. Da Vinci's original plan called for the span to be 720 feet long, but Sand and colleagues scaled it down to 300 feet and built the walkway from Norwegian pine.
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