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.

"That's where they had one of their checkpoints," says rebel fighter Abu Sa'ed, pointing to a small concrete building on the side of the road as we speed past.

ISIS arrived in Addana about a year ago, initially welcomed in the conservative town by Islamist fighters. But within a few months, ISIS had entrenched itself and begun exerting its harsh order through what one fighter calls "terrorism and punishment."

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