The rapid development of the town began after 1860. The Mikes-source was named in honour of count Benedek Mikes, chairman of the spa committee, who appointed a chemist at his own expense to analyse the water of the spring bearing his name. This marked the start of the scientific evaluation and utilisation of local mineral waters. The Stefánia Medical Center was opened in 1890 and remained the treatment center of the spa until 1975. Lake Csukás (now: Ciucaș) was artificially created in 1900, and the big hotels of the town were built in the 1970s.