JDMvW Posted May 13, 2022 Share Posted May 13, 2022 The largest prehistoric mound in the USA- [~ 700,000 cubic meters) Monks Mound, ca. 900-1200 CE (not by aliens or Atlanteans, by the way) 5 Link to comment Share on other sites More sharing options...
Dustin McAmera Posted May 14, 2022 Share Posted May 14, 2022 Photographed when it was newish, in October, and I think it's already gone. 5 Link to comment Share on other sites More sharing options...
mjferron Posted May 14, 2022 Share Posted May 14, 2022 Anthills from hell. (Not our regular nasty fire ants) 5 Link to comment Share on other sites More sharing options...
Gerald Cafferty Posted May 14, 2022 Share Posted May 14, 2022 (edited) Spoil mound from gravel quarry, circa 2010. Edited May 14, 2022 by Gerald Cafferty 5 Link to comment Share on other sites More sharing options...
Glenn McCreery Posted May 16, 2022 Share Posted May 16, 2022 What remains of the Teton Dam, which breached while being filled for the first time in 1976. The ensuing flood killed eleven people and caused billions of dollars in damages. 4 Link to comment Share on other sites More sharing options...
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