Question: an impressive feature of the hopewell culture was its
[{'answer': 'Eastern Woodlands mounds', 'provenance': [{'wikipedia_id': '313110', 'title': 'Hopewell tradition', 'start_paragraph_id': 11, 'start_character': 222, 'end_paragraph_id': 11, 'end_character': 246, 'bleu_score': 1.0, 'section': 'Section::::Mounds.\n'}]}, {'provenance': [{'wikipedia_id': '313110', 'title': 'Hopewell tradition', 'start_paragraph_id': 11, 'start_character': 0, 'end_paragraph_id': 11, 'end_character': 584, 'bleu_score': 0.9768747032089851, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 17635424365529387482}, 'section': 'Section::::Mounds.\n'}]}]