Effigy Mounds National Monument
A National Park Service site preserving more than 200 prehistoric earthen mounds built by pre-Columbian Woodland cultures, mostly between 350–1400 CE. Located at 151 Hwy 76, Harpers Ferry, IA 52146, three miles north of Marquette on the Great River Road. The visitor center sits on a bluff above the Mississippi, and the mound groups — many shaped like bears and eagles — are accessed via hiking trails through forested ridgelines with river views. Entrance fee applies. Visitor center open daily 9 am–5 pm.
The Great River Road (IA Hwy 76) runs directly past the entrance — an unmissable stop on the northeast Iowa corridor. The bluff-top setting above the Mississippi makes it a genuine landmark rather than a detour. NPS stamp for those collecting national park units.
Shot by the riders who've run it.
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