professor kizilhan promises to return. next, we accompany him to the camp at lalish, a village further east. he started coming here in 2014, driven by images that he just couldn't forget. in august 2014, i.s. fighters invaded sinjar, the yazidis' ancestral home. hundreds of thousands were forced to flee. thousands of others were killed. women and children were kidnapped and raped. the un says islamic state's persecution of yazidis amounts to genocide. since that massacre, a huge number of yazidis have been living in and around refugee camps. >> between 450,000 and 500,000 yazidis have left their home area, which is very close to mosul. they don't dare to return because they feel they've been let down, by the kurds, too. many yazidis are calling for a safe zone. they can't just go back and pretend that nothing happened. >> the village of lalish contains the holiest temple in the yazidi faith. it's currently guarded by kurdish pershmerga fighters -- the same fighters who failed to help the yazidis when i.s. mlitants overran