In July I did a holiday to France staying outside Calais in Guines. One of the places we did visit whilst there was La Coupole Centre D’histoire.
This was a planned German V2 launching base, which was abandoned following a devastating bombing raid by the RAF. Still in existence are some of the tunnels and the huge concrete cupola.
The museum was excellent, though slightly reliant on using a tablet computer as you walked around with videos on it.
We really enjoyed our visit to the museum and what I anticipated would be a couple of hours at most, actually we spent most of the day there and even then didn’t experience all that was on offer.