The Most Majestic and Detailed Ancient Roman City Ruins Is Far From Rome

Why would they abandon a great place?

Aside from soldiers and military families, Timgad was also home to Christians and followers of older religions. It became one of the most diverse cities of the Roman Empire and for a long time, it flourished.

Source: PostFun

But somehow, something had happened that resulted in the majestic crumbling of the city to the point that its citizens had to abandon it. By the eighth century, the city was nothing more than just a pile of stones and the sand of the desert slowly consumed it.