where is that museum?
In Mimoyecques in the Pas-de-Calais region of northern France.
V-3 cannon
A suitable site was selected at a limestone hill about north of the Hidrequent quarries, near Mimoyecques in the Pas-de-Calais region of northern France behind Cap Gris Nez, 
who participated in the battle of vimy ridge Four divisions of the Canadian Corps in the First Army, against three divisions of the German 6th Army. where did it take place? In the Nord-Pas-de-Calais region of France. did it also take place in the trenches? Yes, trench raiding was done by the Canadian Corps. was air force used? Yes, both the sides used air force. did anyone get military honors for their service during the battle? Four members of the Canadian Corps received the Victoria Cross. when was this award started? 29 January 1856. who received it in the above mentioned battle? UNANSWERABLE was this battle a part of any big war? Yes, the First World War were any other battles also fought in the region where this battle was fought? Yes, the World War II. what happened at this place during that war? It was used for vengeance weapon installations, including extensive V-1 "ski sites" that launched attacks on England and massive bunkers for the V-2 rocket and V-3 cannon. when was the rocket developed? In 1934 successful launches were conducted. what was its use after the war? At first the United States and the USSR were engaged in retrieving as many of the rockets as possible. Later , the rocket was further developed for military and civilian purposes. which country developed the cannon mentioned above? Germany. which place was bombarded with it? Though plans for bombardment were made but the weapons were rendered unusable. does any museum feature it? Yes, parts and a replica are housed at the Mimoyecques museum.
wiki:13103304
V-3 cannon [SEP] Mimoyecques site
A suitable site was selected at a limestone hill about north of the Hidrequent quarries, near Mimoyecques in the Pas-de-Calais region of northern France behind Cap Gris Nez, very close to the French end of the present day Channel tunnel, where V-1 and V-2 launch sites were already under construction. The site was from the sea and from London. It was code-named "Wiese" (meadow) and "Bauvorhaben 711" (Construction Project 711), and Organisation Todt began construction in September 1943 with the building of railway lines to support the work, and began to excavate the gun shafts in October. The initial layout comprised two parallel facilities approximately apart, each with five drifts which were to hold a stacked cluster of five HDP gun tubes, for a total of 50 guns.