If you have any interest in military or turkish history this is the musuem to visit. Floor after floor of Ottoman weapons ranging from stylish scimitars to giant cannons. And on some days (check site) you get a free live show from an Ottoman marching band (mehter band bit like a highland regiment band in full costume with massive drum and pipes - great fun and much enjoyed by the Turkish schoolchildren on our visit). The text for the exhibits gives the "Turkish perspective" on issues such as Cyprus (but no mention of Kurdish conflict) and some debatable ancient history claiming Attila the Hun for the Turks. There is is even a Turkish submarine. In the grounds there are some giant cannon used in WW1 and a fighter jet. Highly impressive and most exhibits have English text. Companion naval museum is also meant to be good but we did not manage to find it. Recommended
www.tsk.tr/
Valikonagi Caddesi, Harbiye, 34298 Istanbul Istanbul, Turkey
+90 212 233 2720
Google map: bit.ly/Z1eAnD
The naval museum is on the waterfront in Beşiktaş at the ferry terminal, close to Dolmabahçe Palace.