….went to Aushwitz 1 and 2 when doing my A levels, along various other ghettos and camps as part of a 3rd reich tour. You cannot fail to be moved and silenced by the place. We stayed in a centre opposite aushwitz 1 with a view of the perimeter of the camp, not a good recipe for a sound nights kip!
If Enigma and the like has an interest for you Bletchley park is well worth a visit although it does mean going through Milton Keynes!