CAHOKIA, Il. (KMOV.com) -- Near the intersection of I-55 and 255 sits an ancient historical site.

Cahokia Mounds is one of only 23 World Heritage sites in the United States, a list that includes Yosemite National Park and the Grand Canyon.

News 4's Alyssa Toomey shows why Cahokia Mounds is such a special site to have in our backyard.

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