(September 19, 2014) STUTTGART — From Sept. 17 through Jan.11, the "Project: Top Secret!" special exhibition at the Porsche Museum in Stuttgart, Germany will showcase 16 unique vehicles, most of which have never been shown to the public. The range of automobiles on display includes top-secret concept cars, camouflaged prototypes as well as one-of-a-kind record-breaking, testing and experimental vehicles.