This is the road from La Paz to Coroico Bolivia. It decends about 14,000 feet. There are bike (bicycle) rental companies who will rent you a bike for a day to ride down this road, then they pick you and the bike up and take you back to La Paz.
There was a great show about this road I believe on the learning channel the other night. They call this "the most dangerous road in the world". They said they are going to pave it. Get the wings warmed up!