In Nov 05 my wife and I were in Singapore and I took her for a walk to Fort Canning to see the Battle Box, the underground British headquarters.
I've also been to the Malinta Tunnel on Corregidor in the Philippines. I followed up the tour by taking a swim at a hotel poor where I had some drinks. In Manila I had a drink in the Manila Hotel where the Japanese had their HQ.
I spent two months on Okinawa in 1968 when I was in the Marines, but I knew little about the 1945 battle there and didn't know where to look for war sites. I was also on Guam that year. Several years later a Japanese straggler came out of the Guam hills and gave himself up.
I found an overnight stay in Arnhem, Holland last year to be of interest, but we arrived too late to visit the Airborne Museum. The visit prompted me to re-read A Bridge Too Far that I read in the 1980s.
A four hour walking tour of Berlin of Nazi and Communist sites, also last year by insidertours.com was one that I recommend with the Maik Kopeck book in hand.
Then there is my native born town of Detroit, the Arsenal of Democracy, as it was called during the war. A war site so far from the fronts? A Japanese bomb balloon landed in Livonia, a suburb of Detroit in 1945, one of several to reach Michigan from Japan or from Japanese submarines.