Question: where was the tear down this wall speech given
[{'answer': 'at the Brandenburg Gate', 'provenance': [{'wikipedia_id': '716962', 'title': 'Tear down this wall!', 'start_paragraph_id': 8, 'start_character': 171, 'end_paragraph_id': 8, 'end_character': 194, 'bleu_score': 1.0, 'section': 'Section::::Speech.\n'}]}, {'provenance': [{'wikipedia_id': '716962', 'title': 'Tear down this wall!', 'start_paragraph_id': 8, 'start_character': 0, 'end_paragraph_id': 8, 'end_character': 385, 'bleu_score': 0.890086974290425, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 13880545418707479558}, 'section': 'Section::::Speech.\n'}]}]