Bobbing Through Portugal on Boat Made of Wine Corks

"... This summer, John Pollack and Garth Goldstein took an old trade (shipbuilding), a basic principle (buoyancy), and created an ingenious, two-ton, 27-foot craft made of (what else) 165,321 corks. Confident that their vessel was of sound design, the two set sail from the northern Portuguese city of Barca d'Alva, near the Spanish border, where hundreds of Portuguese gathered to watch them embark upon an improbable, 17-day journey on the Douro River. ..."

Sounds like a great way to travel.