I worked at Boeing in Seattle, Washington for a little under 4 years. Whilst there I did some very cool work on the 757, 767 and 737-300 (the 737 with the funny shaped engines) programs. Here are some photo's...
757 Wind Tunnel Model
These were aerodynamically and structurally accurate models that were flown in a low speed wind tunnel at General Dynamic's Lindbergh field facility in Dan Diego. We would mount transducers on the model and then fly it at ever increasing speed until (and if) the model went into flutter. We would change weights, engine struts, etc. to reflect different configurations. I would run a piece of test hardware that would monitor the vibration characteristics of the model when it started into flutter. They had this awesome system to drop the speed of the tunnel instantly to zero so save the model from breaking up if it started fluttering badly. They used the results of this testing to predict what would happen on the real thing.
767 Ground Vibration Test (GVT)
This picture shows our group instrumenting the first 767 ever built (-001) for a full-scale ground vibration test. This was done just prior to first flight. We would mount over 100 low-frequency accelerometers all over the airplane. We then attached a large electromagnetic shaker to the airframe at different points. We would then excite the airframe, record the signals, and synthesize the mode shapes for the aircraft. They would use this data to calibrate the analytical models to predict what would happen in flight. I sat in the white trailer you can see in the right running test equipment to acquire the data and produce the test results.
GE Engine Vibration Test
This test was similar to a GVT but only done with the engine and strut. The engine is attached to what's called a strong-back - essentially a vertical 'ground'. You can see a electromagnetic shaker on the gray stand in the right of the picture. One the left at the base is all of our test equipment. The light green machine was a piece of hardware built by HP. I used to run this.