For insurance purposes if you believe the rug is valuable you will need to have it professionally appraised by an appraiser who is experienced in evaluating such textiles. It will cost you as a full professional appraisal is not cheap. But if it is valuable it will be worth it.
If you don’t want to have it appraised you might want to see if any of the “Antique Roadshow” style shows are coming to your area and try to have it looked at there.
It is just fun to learn the origin of unusual finds.
Find a rug dealer in your area FIRST. Then go to an antique dealer and see how much he will scr** you.