I've been traveling a lot recently. At several airports I've visited, there have been very nice collections of model airplanes. Everything from 1:72 up to 1:3 or 1:2.
One of the better collections was in Albuquerque with roughly 200 or so donated model airplanes. Varying qualities, but some were really quite nice. Unfortunately, I didn't have a camera with me.
SFO has some large scale models (Spitfire and a Hurricane) hanging in the domestic terminals. (They also have a very nice electronics prototyping/ergonomic design display).
I'll try and start taking pictures if I'm on time (

), but was wondering if anyone had any airports to recommend looking around. (Especially if you're stuck for a few hours)