Can confirm - the tour of SLAC is (or was in the early 2000s) a great experience. Apart from the squirrels sitting on the klystrons, I remember a lot of great engineering and 'forward planning': For example, highway 280 was not built when they started construction - but they knew it was coming so they pre-built that bridge that runs 280 over the beamline so that future highway work would not interfere so much with their operations. And they had only just invented lasers - they knew that by the time they had finished construction they would be able use this new invention to align the tubes but they weren't quite there yet with the laser physics so they just left an empty laser calibration tube ready for when someone (machinists?) had completed that part of the engineering (hopefully!). Also I was impressed that their measurement precision is such that they can detect and compensate for the movement of the continental plate associated with the Pacific tides.