At the entrance to the Rotunda is an information board with details about the impressive works to the church, its items of interest, the history and most important aspects.
Books and souvenirs can be bought from the museum.
Rotunda inside: 64m long, 43m wide
Dome's internal diameter: 24.5m
Dome's external diameter: 27m
Dome height: 75m
Dome weight: 45,000 tons
Columns height: 13.5
Main door: 10m high, 4.8m wide, weights 6 tons.