Innovative Digital Heuristic Approaches in Architectural Historical Research

In recent years a great database has aroused concerning the deep transformations triggered by the so-called "digital revolution" in all research fields. Architecture has been highly affected by this phenomenon but, while it is commonplace to measure these changes in terms of "science", much less popular are those aspects connected with the Humanities integrated in any architectural work. History of Architecture represents from this standpoint a perfect example of how new digital tools and approaches can help to disclose novel research opportunities. The paper presents two projects regarding the Vatican Basilica (the Sangallo's wooden model for the New St. Peter and the reconstruction of St. Peter's square "the day before" the moving of the Vatican Obelisk led by Domenico Fontana) as paradigmatic showcases.