Effigy Mounds National Monument

Effigy Mounds National Monument preserves more than 200 prehistoric earthen mounds built by pre-Columbian Woodland cultures, most of them constructed over a span that runs from roughly 350 to 1400 CE. The monument sits right on IA Hwy 76 — the Great River Road — three miles north of Marquette, so riders on the northeast Iowa corridor pass the entrance without any added miles. The visitor center is on a bluff above the Mississippi, and an entrance fee applies.

The mounds themselves are the reason to get off the bike. Many are shaped like bears and birds — the Marching Bear Group alone stretches along a bluff-top ridge and contains ten bear effigies and three bird effigies. The monument recognizes 20 culturally associated American Indian tribes, and the NPS is clear that these sites are considered sacred ground, so the expectation is quiet, respectful exploration. Trails through forested ridgelines connect the mound groups and open onto river views; plan on at least an hour of hiking to take in more than a fraction of them.

For riders collecting NPS passport stamps, the stamp is available at the visitor center. Trail conditions vary by season, and the forested bluff trails can be muddy or slick after rain — worth keeping in mind when deciding whether to walk in gear or carry a change of footwear.