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Wikimedia Commons/National Park Service Effigy Mounds (Iowa) Ancient builders shaped over 200 earthen mounds along the Mississippi River between 700 and 1300 CE. Thirty-one...
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Wikimedia Commons/National Park Service Effigy Mounds (Iowa) Ancient builders shaped over 200 earthen mounds along the Mississippi River between 700 and 1300 CE. Thirty-one...
Wikimedia Commons/Pittsburgh Photo Engraving Co.; unknown artist The Siege of Fort Pitt, Pennsylvania In 1763, Fort Pitt became a powder keg when Delaware, Shawnee,...
Shutterstock Newspaper Rock (Bears Ears) In Utah’s red rock country, one cliff face holds thousands of petroglyphs carved by different groups over many centuries....
Wikimedia Commons/Jud McCranie The Mammoth Cave, Kentucky Four hundred miles of pure darkness, five levels of twisted passages, and one cave system to rule...