We have been organizing the International Karst School “Classical Karst” (IKS) since 1993. The school offers a framework in which both young and established karstologists from all over the world can present new research in the field of karstology, make contacts and familiarise themselves with the Classical karst. Each year we choose a central theme, the history and state of research of which is presented by invited speakers, while the other participants present their research in the form of lectures or posters. The red thread of the school is the afternoon and full-day excursions, during which the main theme is presented at the field sites of the Classical Karst. The last full-day excursion is dedicated to the general presentation of the most important areas of the Classical Karst.