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laura logan has the story.is is what is left of the ancient yizidi city of sinjah. isis sees the yizidis as devil worshippers and their policy here was total annihilation. what you are looking at is 1,000 years of civilization reduced to rubble in 15 months of last november, some 7,000 kurdish peshmerga soldiers backed by heavy u.s. air power pushed the islamic state out of here. the kurds said they killed 300 terrorists in the two-day offensive. this its whs what it takes. there its nothing left. any direction you walk all you find is more destruction. one street after another. an entire city literally in ruins. we walked the shattered streets of the yizidi heartland. who was on his fourth trip to iraq. he told us what isis didn't destroy, kurdish forces leveled as they fought their way in all. haw i asked the peshmerga, the only we to make them go out. only way to make isis go out is destroy the city. >> reporter: only way t them. >> reporter: the father has been studying the mind and method of mass murderers