The main objective of this article was to evaluate the impact of historical events on the visit rate of Bardejov Spa in various periods of its development (in the years of 1814–2016). The collection of information on clients’ spa visits, especially the oldest data, was difficult (19th century and 1st and 2nd World War). Much information was available only in the State Archive of the Ministry of the Interior of the Slovak Republic in Hungarian and Latin. Some data for several years were not available at all, and some data were not recorded in writing. The paper summarizes the history of the spa, natural medical sources, spa treatment and indications. At present, the number of guests has an increasing trend, as evidenced by the visit rate for 2016, as well as by current data for 2017. In 2016, Bardejov Spa reached a pick of the visit rate with 25,863 clients. In 2017, there were 27,170 clients. The main clients are the Slovaks, about 90%.