Question: what is the vatican built on top of
[{'answer': 'Vatican Necropolis', 'provenance': [{'wikipedia_id': '22132474', 'title': 'Vatican Necropolis', 'start_paragraph_id': 0, 'start_character': 0, 'end_paragraph_id': 0, 'end_character': 18, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '22132474', 'title': 'Vatican Necropolis', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 658, 'bleu_score': 0.9137515499081551, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 4884526033472712799}, 'section': 'Section::::Abstract.'}]}]