If you are ever in Boston you must visit BMOS. This museum house the world’s largest air insulated Van De Graaff generator and they demonstrate it daily in their Theater Of Electricity. It is simply amazing. They also have two large 18″ diameter Tesla coils plus a smaller tube powered Tesla coil that are part of the show. It can be a little scary for very young children, but otherwise is a “must see” for anyone interested in electricity!
Lots of historical information and images of different types of static generators.