Question: where was the movie days of heaven filmed
[{'answer': 'Whiskey Gap , Alberta', 'provenance': [{'wikipedia_id': '443718', 'title': 'Days of Heaven', 'start_paragraph_id': 22, 'start_character': 108, 'end_paragraph_id': 22, 'end_character': 129, 'bleu_score': 1.0, 'section': 'Section::::Production.:Principal photography.\n'}]}, {'answer': 'Heritage Park Historical Village , Calgary'}, {'provenance': [{'wikipedia_id': '443718', 'title': 'Days of Heaven', 'start_paragraph_id': 22, 'start_character': 0, 'end_paragraph_id': 22, 'end_character': 230, 'bleu_score': 0.887508747915121, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 16064671510985732540}, 'section': 'Section::::Production.:Principal photography.\n'}]}]