For any Porsche fan, a visit to the Porsche Museum in Stuttgart is a must. The museum recently moved its spare vehicles into a new warehouse which led to a video featuring inventory of some of the more unusual Porsche projects.

Throughout Porsche’s earlier years, the company struggled to build race cars and vehicles for the public. To keep the balance, Porsche took on uncredited engineering contracts with other automakers.

Did you know about the idea borrowed from IBM of a “Porsche Junior,” or a 928 convertible that should have been built, a concept car that could last 30 years and even a Porsche-Diesel tractor?

Watch the video above to see all the struggling Porsche projects before the company became successful.