Bulent Kilic/Agence France-Presse – Getty Images

The predominantly Kurdish town of Kobani is devastated after months under siege by Islamist forces and airstrikes by a United States-led coalition.

Recent satellite image analysis by Unitar-Unosat, an agency of the United Nations, reveals vast devastation in cities across Syria from the civil war that started nearly four years ago. The four cities below are among those analyzed by the agency, which examined images taken before and during the conflict.