Hot Wheels is owned by Mattel, and they do not have a museum... not yet. They do have so many incredible people that have worked their in the past, and have a lot of great people who work there now, and the archivist/historian is fantastic. She has a goal of getting a museum that can share all the immense historical value of the original drawings, designs, concepts, prototypes, etc of the many lines of toys that Hot Wheels, and other Mattel companies like Barbie have generated over the past 5 or 6 decades.
Some fantastic original art works have been digitized already, and if nothing else, the history of the company, and it's many iconic products has not been lost, it's been getting scanned and filed so that nothing will be forgotten... and a lot of people dig the many things that Mattel has produced.