Constantine’s devotion to Christ and the Saints will inspire him to build churches at important sites of Christian pilgrimage most significantly at the reputed site of the tomb of Saint Peter in Rome and the tomb of Jesus Christ in Jerusalem. In turn, these pilgrimage site will play a powerful role in influencing the faith throughout the Roman Empire.

Links:

Image of the Constantinian Saint Peter’s Basilica

CONSTANTINIAN SAINT PETER’S BASILICA

Plans showing overlap of Nero’s Circus, Old Saint Peter’s and the Present Saint Peter’s Basilica
Images of architectural work under Saint Peter’s Basilica

Images of the exterior of the basilica can be found here
Interior of Old Saint Peter’s Basilica and here.

Video tour through 3-D reconstruction of Old Saint Peter’s Basilica
Rutika Parulkar and Shreyas Gavande, “The Making of Saint Peter’s Basilica” – pp. 4-8 have nice diagrams on the transformation of Vatican from cemetery to basilica and the relationship of basilica to important tombs underneath.
Several good images of Old Saint Peter’s Basilica

OTHER CONSTANTINIAN CHURCHES IN ROME
Isometric Reconstruction of Saint Laurence Outside the Walls in 330 AD

CHURCH OF THE HOLY SEPULCHRE

Exterior of the Church of the Holy Sepulchre
Interior Plan of the Church of the Holy Sepulchre and here and here.

Church of the Nativity and here.

Anonymous Pilgrim of Bordeaux
The Pilgrim Egeria

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#346 – A History of the Catholic Church – Saint Peter’s and the Holy Sepulchre