Effigy Mounds National Monument is in fact quite the hike, we did it on 11-2 and we were glad we had a bottle of water along. The mounds themselves are difficult to make out, spreading lime like they use to make the lines on foot ball field may have helped. the most impressive one we saw was the Big Bear.
However the two overlook points; Eagle Nest and Fire Rock, over look the Mississippi River with a view that is worth the hike.
Please take the time to watch the 15 minute video at the visitor center it will help you understand and appreciate the effigy mounds.
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