In addition to AC generation, his experimental opus was very wide and includes rotating magnetic field, Tesla coil transformer, and the list goes on. One of the better known patents (among 700+) was also wireless transmission, which was unfairly attributed to Marconi for a long time. This is not to say that Marconi was not brilliant as well, but just speaks about Tesla's genius.
With pride, I can say that I have visited the museum myself in Belgrade. I also attended the elementary school called Nikola Tesla in the near by city called Novi Sad.
I am embarrassed to say that I haven't yet. I've been back to Belgrade at least twice since I've emigrated to Canada, but I didn't make the time to go.
I'm planning to go back very soon, so that will be a priority.