Here are a few suggestions for your next trip from Lens(F)

In 2 hours, you can reach Lille, Paris, Brussels, Anderlecht, Schaerbeek, Molenbeek-Saint-Jean, Ixelles, Uccle.

In 3 hours, you can reach London, Antwerpen, Gent, Charleroi, Liège, Brugge, Rouen, Leuven, Mons, Reims.

In 4 hours, you can reach Luxembourg, Esch-sur-Alzette, Rotterdam, The Hague, Dudelange, Lyon, Schifflange, Köln, Bettembourg, Strasbourg...