By Arwa Damon and Raja Razek
updated 7:59 AM EST, Mon February 17, 2014
Addana, Syria (CNN)
-- From the moment we cross the Turkish border into Syria, evidence of the Islamic State in Iraq and Syria's draconian and brutal rule lingers.
More than a month after the group was driven from the town of Addana, residents here drive through the streets, pointing out where ISIS fighters carried out executions and left bodies to rot for all to see.
Amid the civil war in Syria, another war is taking place -- one that pits moderate and Islamist rebels against radicals from ISIS, a group so radical that even al Qaeda has reportedly distanced itself from it. Both groups of fighters are opposed to the government of Syrian President Bashar al-Assad.