For today's Geo Quiz, we're headed to the lost city of the Incas. Now, we're not asking you to name that ancient city in Peru. That'd be too easy. It's Machu Picchu, one of the world's best known archaeological sites. What we want to know is who discovered Machu Picchu. This American explorer was a Yale professor at the time of the discovery ï¿½ in 1911. Today, in Peru, you can find a train that bears his name. We'll take a ride on that trainï¿½ And reveal the name of this man who some say was a real-life model for the fictional Indiana Jones.