The cars on display at the Porsche Museum in Stuttgart, Germany are all utterly remarkable in one way or another. In fact, we might wager that there is no other automotive marque on earth that can lay claim to having produced so many noteworthy and significant sportscars over the years.

So, what about the cars in Porsche's collection that don't make it into the Porsche Museum? It turns out that they're pretty darn remarkable, too.

Proving that point, Speedhunters recently went to the Porsche Museum Storage Garage - a semi-secretive facility where the German sportscar manufacturer stows the overflow from the museum - to have a (supervised) look around.

Startling fact No. 1: the Porsche Museum Storage Garage currently has a collection of about a dozen Carrera GTs - nearly one percent of the total number of examples sold over its four-year production run. The car is notable for its use of carbon-fiber and its 200-plus-mph top speed, courtesy of a V10 originally developed for Formula 1 racing.

The garage is also home to the first road-legal Porsche 911 GT1 ever built. The GT1 was a super-low-volume mid-engine 911 model built to comply with the FIA's GT1-class homologation rules. Reportedly, just 21 were built, on a chassis formed from effectively joining the Type-993 911's front half with the Type-962 race car's rear.

Startling fact No. 2: only about 20 percent of the cars kept in the Porsche Museum Storage Garage could be prepared and driven within 30 minutes. Porsches - like most cars - don't much care for sitting, so some extra prep work would be required to get most of the fleet going again.

The most recent super-special halo car in the marque's history was arguably the Porsche 918 Spyder - a limited-run, super-high-performance hybrid built to demonstrate the automaker's hybrid proficiency at the same time its 919 Hybrid race car was battling for dominance in the FIA World Endurance Championship's LMP1 class. But even better than the finished production car, Porsche storage garage has a 918 test mule built on a Carrera GT chassis - a singularly rare specimen indeed.

We can hardly believe it ourselves, but the Porsche Museum Storage Garage might house a more fascinating collection of rare machinery than the actual museum itself.