The image is a photograph of a sign on a wall that reads "Cahokia-the grandest Mississippi town-is an Illinois treasure". The sign is rectangular in shape and has a white background with black text. On the left side of the sign, there is an orange banner with a map of the state of Illinois in the center. The map is divided into different sections, each with a different color scheme. 

On the right side, there are two smaller banners with the same text. The first banner on the left has a black background with white text and an illustration of a group of people standing in front of a mountain range. The second banner has a blue background with an image of a man and a woman standing on top of a cliff. The text on the banners reads "Imagine you live in Cahokia."

The sign appears to be part of a museum or exhibit, as there are other exhibits visible in the background.