A port of embarkation for the Crusades inland

Chateaubriand compared this city to "a ship of high edge stranded on the sand, where left Saint Louis, time and the sea". Located at the edge of marshes (still waters) along the Mediterranean Sea, the city was created from scratch, in 1240, by the King of France Saint Louis, who endowed France with its first Mediterranean port. He drove from Aigues Mortes the last two crusades of history, those of 1248 and 1270, and died just arrived in Tunis. 
You can visit the moving N-D des Sablons church, in which the king and the Crusaders came to pray before their departure. At the end of the 13th century, the sons of Saint Louis built the ramparts surrounding the town, which are preserved on their entire perimeter. 
The tour of the city is fascinating: do not miss the Tower of Constance, magnificent cylindrical dungeon with remarkable defensive architecture, which served as a prison during the wars of religion, and if you have the time, do the complete tour of ramparts that offers remarkable points on the marshes and saline that extend over 20000 ha. 
Do not miss either (if they are open) the penitents' chapels and their 17th century decor, which testify to the ever-active devotion.