The The 23rd International Congress on Acoustics is over. ICA 2019 was held in Aachen, Germany, 2019 September 9-13, and was a great success. The congress was hosted by the German Acoustical Society (Deutsche Gesellschaft für Akustik, DEGA). Our special thanks go to congress chair Michael Vorländer, congress vice-chair Janina Fels, and technical program chair Martin Ochmann.