Historic site
Portsmouth Earthworks
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The Portsmouth Earthworks are a series of prehistoric geometric enclosures and mounds built by the Hopewell culture between 100 BCE and 500 CE. Located along the Ohio River, these earthworks once covered over 100 acres, though much has been lost to development. Today, visitors can explore preserved sections, including a large conical mound and remnants of walls. The site offers a glimpse into the sophisticated ceremonial and social practices of ancient indigenous peoples.
Don't miss
- View the large conical mound, one of the best-preserved features.
- Walk the interpretive trail with signs explaining the earthworks' history.
- Visit the nearby museum for artifacts and more context on the Hopewell culture.
Tickets & tours
Ways to visit Portsmouth Earthworks
You can usually visit on your own. A tour is worth it for transport, a guide, or combining nearby sights into one day.
Cheapest way inAudio Guided Walking Tour from Old Port of Portland, Maine4.3★ · 58 travelers1–2 hoursFree cancellationFrom$8 per personSee dates →
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