Adjoining the harbor, this important station was built in 1857. Though severely damaged during the WWII, it still is a sight not to miss.
Wikipedia (French) http://fr.wikipedia.org/wiki/Gare_de_Saint-Nazaire#Ancienne_gare
Address 21 Rue Henri Gautier, Saint-Nazaire 44600, France
Coordinates 47°16'38.521" N -2°12'16.333" E