dates back to the 15th century and led some doctors to study their therapeutic effects. It seems that the famous doctor and naturalist Paracelsus (1493-1541) also visited the area. In 1700, when the physician Francesco Roncalli Parolino wrote in his paper 'De acquis brixianis', in 1724 to be precise, a remarkable revival took place. Roncalli himself reiterated the effectiveness of the "aquae bogiarianae" in "Europae Medicina" (1747). In the 19th century, Ottavio Ferrario (1840) conducted new research and the first chemical analyses. Alessandro Manzoni wrote to Giovanni Morelli (Giovanni Morelli), a doctor from Bergamo, on 16 December 1845: "I have reason to regret not having taken advantage of the kind and cordial exhibition you gave me to obtain Boario's water directly from the owner of the land". In 1857, dr. Biffi, the first medical scientist of the Austrian lieutenant in Lombardy described it as "the most active in Lombardy". However, according to Cantù, the revaluation of the waters of Boario came about thanks to doctor Zattini of Darfo in 1858. Since then, more and more people have been coming to Boario to treat themselves, but staying in nearby villages such as Darfo, Corna, Esine, etc. Only in 1906 the waters of Boario were revalued. Since then, the first spa building with features such as an Art Nouveau dome was built and, in 1906, the Hotel Terme was also built, followed by the construction of other hotels. However, it was not until 1914, with the construction of a thermal spa, that the therapeutic value of the waters was scientifically and methodically developed. As a result of this development, Royal Decree No. 765 of 15 April 1926 elevated Boario to the status of Autonomous Board of Health. Between 1951 and 1952, a new spring was discovered, now called Fausta, in honour of its discoverer Dr Fausto Cardio. A few years later, with the extension of the park, the spa was completely transformed and a new pavilion and a huge auditorium were added. This small spa also survived the terrible flood that hit Boario on the night of 17 September 1960. In 1964, a new spa named after Alessandro Manzoni was opened. In 1965 the old spa establishment, dedicated to Adolfo Ferrata, was enlarged and modernised. New and modern hotels and guesthouses increased the accommodation capacity of Boario Terme. The thermal spring is located in a vast park, in the middle of shady