Thermae Bath Spa £45 million. Thermae Bath Spa eventually opened to the public on 7 August 2006, ending a 28-year period during which the waters remained unavailable for bathing. The spa is largely sited in a new 'Glass Cube' building by Sir Nicholas Grimshaw, near the site of the ancient Royal Bath, which has been interlinked with historic Georgian spa buildings such as the nearby Hot and Cross Baths. The building is in a strongly contemporary style in contrast to its Georgian surroundings. The complex houses both traditional and modern spa facilities. A 2014 survey indicated the spa attracted an extra 260,000 visitors
Ancient Roman architecture air. The Roman architect Vitruvius, writing about the end of the 1st century B.C., attributes their invention to Sergius Orata. Many remains of Roman hypocausts have survived throughout Europe, western Asia, and northern Africa. The hypocaust was an invention which improved the hygiene and living conditions of citizens, and was a forerunner of modern central heating. Hypocausts were used for heating hot baths (thermae), houses and other buildings, whether public or private. The floor was raised above the ground by pillars, called pilae stacks, with a layer of tiles, then a layer of concrete, then another of tiles on top;