The Rosicrucian Temple and museum is indeed cool. Just go in knowing that a fair amount of the history presented is fraudulent (as you'd expect from an 19th century fraternal organization that truly believes it has a continuous history extending all the way back to ancient Egypt).
But if you keep that in mind it is cool. And a lot of the straight Egyptology on display is accurate, just be wary of the claims about the organization. (
Here's a brief overview)