Thermes de Cluny
The Thermes de Cluny are the ruins of Gallo-Roman thermal baths lying in the heart of Paris' 5th arrondissement, and which are partly subsumed into the Musée national du Moyen Âge - Thermes et hôtel de Cluny. History. The present bath ruins constitute about one-third of a massive bath complex that is believed to have been constructed around the beginning of the 3rd century. The best preserved room is the "frigidarium", with intact architectural elements such as Gallo-Roman vaults, ribs and consoles, and fragments of original decorative wall painting and mosaics. It is believed that  the bath complex was built by the influential guild of boatmen of 3rd-century Roman Paris or "Lutetia", as the consoles on which the barrel ribs rest are carved in the shape of ships' prows. Like all Roman Baths, these baths were freely open to the public, and were meant to be, at least partially, a means of romanizing the ancient Gauls. As the baths lay across the Seine river on the Left Bank and were unprotected by defensive fortifications, they were easy prey to roving barbarian groups, who apparently destroyed the bath complex sometime at the end of the  3rd century. The bath complex is partly an archeological site, and has partly been incorporated into the Musée national du Moyen Age (or Musée de Cluny). It is the occasional repository for historic stonework or masonry found from time to time in Paris. The spectacular "frigidarium" is entirely incorporated within the museum and houses the "Pilier des Nautes" (Pillar of the Boatmen). Although somewhat obscured by renovations and reuse over the past two thousand years, several other rooms from the bath complex are also incorporated into the museum, notably the "gymnasium," which now forms part of gallery 9 (Gallery of  French Kings and sculptures from Notre Dame that were taken down during the iconoclasm of the French Revolution). The "caldarium" (hot water room) and the "tepidarium" (warm water room) are both still present as ruins outside the Musée and on the museum's grounds.