Kelly, next time I'm around a C-5 I'll have to remember to get one of the crew to explain the gear in further depth, but I know the geometry of it and the way it rotates 90 degrees prior to retracting into the bays is integral to how they keep a flat cargo floor that is low enough to load heavy armored vehicles and such.  The WW1 aircraft there were all replicas, so not priceless like authentic airframes would be, but still very rare to see.  I asked around about the engines in them.  The SPAD has a Lycoming instead of a Hispano like they used back then, the Pup and Fokkers have Le Rhone rotary engines which are quite similar to the originals.  (Fokker used engines produced by Oberursel which were basically a clone.)  I know the Bleriot was trucked to Osh, not sure about the others but they belong to Old Rhinebeck Aerodrome in New York.