Adult tickets are $12. No photography allowed.
This is some of the cool stuff I learned and saw:
1. The atomic cannon (1953). This was the first and only atomic cannon. The shell delivered 15 kiloton's worth of nuclear goodness.
2. Testing near Vegas Strip. I had no idea how close the testing was. You could actually see the mushroom cloud from Fremont Street.
3. Kosmos 954 (1978). A nuclear powered Soviet satellite crashed into the Canadian wilderness. Full story here.
4. Bikini Atoll test (1946): The water-borne test left me speechless.
Here is a great overview of the museum: