The Great Spa Towns of Europe is a transnational World Heritage Site consisting of a selection of 11 spa towns across seven European countries. They were developed around natural mineral water springs.[2] From the early 18th century to the 1930s, Western Europe experienced an increase in spa and bathing culture, leading to the construction of elaborate bath houses.[1] These would often include gardens, casinos, theatres, and villas surrounding the springs and the bath houses.[1][3]