Bridge Designed by Da Vinci Opens.

Almost 500 years ago, Leonardo da Vinci sketched a bridge so ambitious, it would have been the world's longest expanse. Critics said it couldn't be built and a skeptical sultan scrapped the project.

Five centuries later, the bridge Leonardo hoped would span an inlet on the Bosporus opened on Wednesday. It's a smaller version, built of wood, 1,500 miles north of Istanbul - but organizers promise the product is true to the master's plan.