Of the roughly 575 original vehicles Porsche has in its collection, only 85 are on display at the Porsche Museum. Some of the others are either on tour or in the Classics workshop, but most hide in an unmarked building just outside Stuttgart. Concept cars, design studies, race cars, prototypes, mules, test vehicles, ideas that were put on a hold for years, or for good. Not many get to see them, but we got lucky. Welcome to Treasure Island, the Porsche way. Zoom in and analyze the details, this place is full of unclassified secrets.