caption: The image shows a poster for the Internationale Luftschifffahrt Ausstellung in Frankfurt, Germany. It features a building, two hot air balloons, and text written on it. The building is a tall, modern structure with a large, white facade and a red roof. The hot air balloon is a bright yellow color and is flying in the sky above the building. The text on the poster is written in a bold, black font and is surrounded by a white border.