A few of the other things that, to me, were astounding, all of them actual aircraft, not replicas:
The world's only flyable Zero and one of the few left in any condition.
An He-162A-1 Volksjager.
A J8M1 Shusui.
A G4M1 Betty.
A J2M3 Raiden.
A Horten Ho-IV Flying Wing Glider.