Official websites use .gov
A .gov website belongs to an official government
organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you’ve safely connected to
the .gov website. Share sensitive information only on official,
secure websites.
U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590
202-366-4000
This aerial view reveals the astonishingly large Monks Mound, located at Cahokia Mounds State Historic Site.
Public Domain. Cahokia Mounds State Historic Site
Download Original (4206 x 2496 pixels, 2372.4 MB)
