This is the 1-kilometer (0.6-mile) Van Gogh Bicycle Path in Nuenen, the Netherlands. It gathers energy from a solar panel by day, and uses that energy to power the luminescent paint covering the path at night (previously: this energy-free glow-in-the-dark solution). Beautiful, isn't it? You know what I wish they had though? Bike paths that are wide enough to drive cars on. "They're called roads." DID I JUST INVENT SOMETHING?!
Keep going for a couple more pictures and a video.
Thanks to becca, who agrees the coolest bike paths are the ones through the woods where you can smell the trees and see WILDLIFE IN ACTION.