I would highly recommend a visit to the NRAO VLA to anyone interested in technology/radio astronomy. The visitor center is one of the better ones I have been to, with a great video discussing the technical details of the VLA along with exhibits and hands-on displays. The self-guided walking tour has many useful signs to explain things along the way. I usually don't comment on gift shops. but the one in the visitor center has some of the best prices for goodies. Enjoyed the visit!