old war bunker on diamond head crater overlooking waikiki skyline in oahu, hawaii

diamond head state monument bunker background sky military summer travel nature city landscape light building clouds green architecture blue tropical park hawaii adventure beautiful hiking skyline coastline cityscape island tourism coast hike war oahu aerial hill honolulu waikiki view pacific ocean old crater overlooking close atop famous hawaii bunkers built early 1900s area#39aph39#s coastal defense system