In Wide Urban World, I talk about Cahokia as an example of an ancient urban center. I also mention a challenge now going on now. This is the "This Place Matters Community Challenge," a contest presented by the National Trust for Historic Preservation. The top three sites will receive a cash prize to help preserve their site. The challenge hopes to "highlight the important role that historic buildings and properties play in preserving our national heritage as well as in preserving our environment." If you check the other sites on their list and compare them to Cahokia, you will definitely vote for Cahokia. So please do so!