The oldest of them is the Gymnasium Kadaň that was established in 1803 with 99 students and continued under the control of the Piarists until 1823. The seat of the old Gymnasium was a former Minorites Monastery (different from the Franciscan Monastery) near the square in a building which is now residence of the Regional Archives. The institute of Gymnasium was then reestablished in 1872 in a new building. The Gymnasium was closed again in 1951 and the new Industrial School moved to the building. It is still there today. A new Gymnasium was established in 1968 and has remained on the same premises since 1978.