All three jet prototypes that have been mentioned in this thread survive in european museums.
The Bristol Type 188 "All Steel" can be seen in the RAF Museum Cosford in
the UK.
Bristol Type 188 airplane pictures & aircraft photos - RAF Museums
The VJ-101 can be seen in the Deutsches Museum, Munich, Germany.
Their Schleissheim display also has several protypes.
Deutsches Museum: EWR-Süd VJ-101 C, 1965
The Trident can be seen in the Musee de'l Air, Le Bourget, Paris, France.
Halls d'exposition> Site officiel du musée de l'Air et de l'Espace
Off all these early jet prototypes I like the Nord Griffon the best for looks.
Photos> Site officiel du musée de l'Air et de l'Espace
All of these museums are definately worth a visit and have many early jet prototypes on display.
I was just in Paris and the Trident is on display in the corner on a pole.
So go and enjoy!