My younger son really wanted to visit the Titan Missile Museum. I was very pleasantly surprised at how informative it was. Our tour guide had worked there for 4 years when it was an active military site, so he had lots of good information to share. It was about a 45-minute guided tour which we made reservations in advance.
On the way there, we stopped at San Xavier del Bac Mission. It was beautiful mission. Unfortunately, there was construction going when we were there. Currently you can walk into the back of the church & spend about 5 minutes there. I heard it's a great place to watch the sun set.
