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Atlas Obscura - Latest • Jan. 18, 2026, 1:36 p.m.
LSU Campus Mounds in Baton Rouge, Louisiana
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The mounds on the LSU campus were originally built at a prominent landmark along the Mississippi River that would have been recognizable to any traveler 11,000 years ago when construction most likely began. The mounds were periodically built and modified over thousands of years, even while the River shifted its course.
Experts don't know why the Native American builders created them, or how they used them. But people believe that they may have been a meeting place and a site for sacred and secular events.
Twenty-first century research has indicated that these mounds are older than previously proven with scientific techniques, suggesting that they may be the oldest extant human-built structures in the Americas.
Experts don't know why the Native American builders created them, or how they used them. But people believe that they may have been a meeting place and a site for sacred and secular events.
Twenty-first century research has indicated that these mounds are older than previously proven with scientific techniques, suggesting that they may be the oldest extant human-built structures in the Americas.
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