From Paris, 2 major roads leads in the Aisne in less than 2 hours.
The highway Nord-A1 to Lille-Bruxelles, then la Francilienne A104 in following Soissons. You will arrive at Soissons.
The highway A4 to Reims-Strasbourg, then Château-Thierry.
From Lille, 1 major road leads in the Aisne in less than 1 hour.
The highway A1 to Paris, then highway A26 to Reims and exit Saint Quentin.
From Reims, 1 major road leads in the Aisne in less than 1/2 hour.
Take A26/E17 to Laon. Take the very first exit Laon.