As an aside, I love the fact that here in France 'health & safety' consists of 'please don't do that as its unsafe and not very sensible' or 'we have not put a handrail here because we know you are not silly enough to walk off the edge ,or allow your children to do so'.
As the name suggests this tower, which has been here in some form or other since the12th century, was used as a lookout tower before being converted in the 15th to be used as a lighthouse. The 55 metre high tower with its fire constantly burning was visible well out to sea and offered incoming ships a good navigational marker. The tower became a naval prison in the 16th century and later in the 19th century a military one.
The fact that the port changed hands between the English and the French on a number of occasions, meant that the prisoners were multinational albeit probably at different times.
There is evidence of French,English,Dutch,Spanish,Irish and even one poor Scot from near Montrose
Oh freedom why hast thou forsaken me?
Your climb takes you right to the top of the tower and out on to the roof terrace via a door in the latern where you have more wonderful views of the city and out to sea, then into the Gothic spire itself where you have to admire these early artisan's craftsmanship!
View along rue 'Sur les Murs' to the other two towers.
View out to sea -you can understand why they put it here!
Just for fun,how it might have looked before the silt took hold.
Inside the lantern,which sits offset on the terrace, is pretty with its coloured glass.