Everything, really. The museum was an unforgettable experience where I got to handle artifacts originating from all around the world. Doing research and reading about what each unique item had to do with the broader story of the Cold War was very fun. Even mundane tasks like wrapping up and object or putting a box away was a lot of fun because of the contextualization that I am having an impact on the future study and research of the Cold War. The other staff were nice and were very helpful whenever I asked for help with something. I learned a lot from them and I think they learned a lot from me as well.
What I wish was different
A lot of the work flow was the same every day, and some objects are not as interesting as others. For example: cataloging a bust of Lenin is more fun then cataloging over 500 photographs.
Advice
If you have a passion for history, then museum work is definitely something that one should experience at some point in your life. It is very fulfilling.