I came across an interesting detail from the Basilica of St. Mary of Health, Venice. This is the splendid Basilica by Baldassare Longhena situated at the Punta della Dogana which is therefore also called Punta della Salute:
This is the High Altar of the Basilica. Note that no people's altar has been installed there; hence, Mass is always celebrated versus Deum (click on pictures to enlarge):
To the right of the altar, you see a rather splendid seat for the priest. This is actually a papal throne offered to St. Pius X, the former Patriarch of Venice, by the dioceses of the province of Venice on the occasion of the 50th anniversary of his ordination to the priesthood:
(The last three pictures are from the Ialian forum Cattolici Romani.)