An interesting aside I find in this pic are the three big microphone stands along the Altar. ( Hey wait a minute you say - weren't we told that the older form of the Mass was supposed to be mumbled in in-comprehensible Latin with the priest's back to the people?)
Here is another pic of the Basilica.
One of the innovations of the renaissance was that architects used light much better. A comment on the old St Peters was that it was quite dark, and I can understand this as many of the older basilicas seemed to be dependent on artificial light for one to enjoy the treasures in them.