It's no surprise that this rad pedestrian bridge is a Dutch design. The Luchtsingel bridge, in central district of Rotterdam in the Netherlands, rises above a busy network of roads and railways, cuts through a building, connects a park and a rooftop garden, and, as a result, adds a human touch to an otherwise industrial cityscape. As if that wasn't cool enough, it is among the first infrastructure projects of this scale to be crowdfunded. Elma van Boxel and Kristian Koreman, of Zus Architects, divided the 350-meter-long (~1148 feet) bridge into 17,000 yellow-painted planks and offered members of the public a chance to buy their own plank for 25 Euros, and engrave their name or a wish into the wood. It's an interesting way to build cities with the help of its residents.