200km north of Istanbul lies the Gallipoli Peninsula. A breathtaking stretch of Turkish coast, steeped more in recent history than ancient history, with many interesting WWI sites to visit in a single area. I found the stories of comradeship between the NZ, Australia, British and Turkish soldiers extremely moving. You are able to visit the remaining trenches, untouched since the war (the original barbed wire remains) and see how unbelievably close the groups of soldiers were during most of the war. In the area there are monuments and cemeteries for each nation and beautiful, yet windy, beaches to visit. Imagine what life must have been like for them, fighting a war in such an idyllic location.
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For those who enjoy a boat trip, then you should also include a crossing of the Dardanelles to visit Chanakkale and its museums, or even a visit to ancient Troy. From Kabatepe you can enjoy a day on the island of Gökçeada. In 1915, this latter was known to Sir Ian Hamilton as Imbros and it was where he had his headquarters for most of the campaign.