The Thermes de Cluny are the ruins of Gallo-Roman thermal baths lying in the heart of Paris" 5th arrondissement. 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 evidenced by the fact that 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 now partly an archeological site, and partly incorporated into the Musée national du Moyen Age, and as such 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. 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). The caldarium (hot water room) and the tepidarium (warm water room) are both still present as ruins outside the Musée itself and on the museum"s grounds.
References:Rosenborg Palace was built in the period 1606-34 as Christian IV’s summerhouse just outside the ramparts of Copenhagen. Christian IV was very fond of the palace and often stayed at the castle when he resided in Copenhagen, and it was here that he died in 1648. After his death, the palace passed to his son King Frederik III, who together with his queen, Sophie Amalie, carried out several types of modernisation.
The last king who used the place as a residence was Frederik IV, and around 1720, Rosenborg was abandoned in favor of Frederiksborg Palace.Through the 1700s, considerable art treasures were collected at Rosenborg Castle, among other things items from the estates of deceased royalty and from Christiansborg after the fire there in 1794.
Soon the idea of a museum arose, and that was realised in 1833, which is The Royal Danish Collection’s official year of establishment.