I visited the Atlit Detention Camp a few years back and found it to be a very informative and moving experience. Atlit is where the British detained Jews who illegally entered Palestine while fleeing Europe during World War II. There is a newly acquired ship on the grounds. Other than that, the structures are pretty much as they were back in 1945. In addition, there is an information center and an interesting film. Older children can gain a lot from the experience. I strongly suggest arranging a guided tour to make the visit worthwhile.
Atltit Detention Camp - Atlit (situated between Netanya and Haifa off of Road Number 2) - 04-984-1980 - CALL IN ADVANCE