Built by the Turks (with Romanian labour), after the annexation of Braila by the Ottoman Empire, it worked for almost three centuries (1538-1828) until the Peace Treaty of Adrianople when it was demolished by the Russians (ironically, also with... Romanian labour). During it, the Danube fortress experienced moments of increase and decay, received the “baptism of fire” under siege, and was supplemented with defensive elements to support its mission. Its numerous plans and some more or less faithful descriptions, combined with the archaeological researches practised here and there (to note that Braila has developed on “vertical” so that the Turkish citadel elements as long as they had been preserved from the remains of the “old city” being scattered under modern buildings), allow a reconstitution close to reality today at the level of a “didactic model” and, if desired, at the city level, as a museum/tourist attraction, and not only. Beyond the memory (plans and descriptions, toponymy, urban legends), what else has been preserved from the Turkish fortress of Braila? “Known” by the majority of today city inhabitants – who will always choose to tell legends about the hearsay tunnels that cross the whole city, sometimes coming out of its perimeter far outside, however, “crossing the Danube” – but in reality known to few, it is the “city” below the city. It is about the “famous” underground galleries being in various states of conservation, which still make their presence felt after collapses or some other of the public activities, reliving the memory of an underground still mysterious, feared for its destructive potential (danger of collapse) and having rather a broken path (either they were filled with compaction material where the buildings were erected above them, or they were “valorized” by segmentation, isolation and transformation into storage space of the modern houses above).