For more than two years, ISIS forces who occupied this northern Syrian city paid little attention to the tip of an old gate on an empty mound of land where they dumped trash.

They were clueless the gate ran several feet into the ground down to something they might well have destroyed had they known: The ruins of an ancient Christian refuge, or early church, possibly dating back to the first centuries of Christendom’s existence, under the Roman Empire.

“I was so excited, I can’t describe it. I was holding everything in my hands,” Abdulwahab Sheko, head of the Exploration Committee at the Ruins Council in Manbij, told Fox News, as he led a reporter on a recent tour of the ruins.

Among the artifacts found that indicate this was a significant site for Christians were several versions of crosses etched into columns and walls, and writings carved into stone.