Citadelle Mont Louis Leave a Comment / Uncategorized / By admin The citadel of Mont-Louis is a military structure built in the seventeenth century with the new town of Mont-Louis and its defensive wall in the present-day French department of Pyrénées-Orientales. It is the 10th station on the yellow train line Train Jaune Church of Saint Louis Fortress Mont Louis The fortress is build in 1679 From Mont Louis there is a bus 560 to Perpignan, who will pass also the village Villefranche de Conflent and Fort Liberia