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Ciechocinek is a spa town in Kuyavian-Pomeranian Voivodeship, Poland, located on the Vistula River about 10 kilometres east of Aleksandrów Kujawski and 20 kilometres south-east of the city of Toruń.
Ciechocinek is known for its unique[how?] 'saline graduation towers'. Experts have considered the local saline springs to be of extreme value and named the thermal spring no. 14 "a wonder of nature". The therapeutic qualities of these springs are directed toward curing cardiovascular, respiratory, orthopedic, traumatic, rheumatic, nervous system and women's diseases.

A graduation tower is a structure used in the production of salt which removes water from a saline solution by evaporation, increasing its concentration of mineral salts. The tower consists of a wooden wall-like frame stuffed with bundles of brushwood (typically blackthorn) which have to be changed about every 5 to 10 years as they become encrusted with mineral deposits over time. The salt water runs down the tower and partly evaporates; at the same time some minerals from the solution are left behind on the brushwood twigs.
Graduation towers can be found in a number of spa towns, primarily in Germany but also Poland and Austria. The mineral-rich water droplets in the air are regarded as having beneficial health effects similar to that of breathing in sea air.
A large complex of graduation towers is located in Ciechocinek, Poland. This entirely wooden construction was erected in the 19th century by Stanislaw Staszic. The complex consists of three graduation towers with a total length of over 2 km. Many tourists visit it for health reasons.