The Church of the Assumption of Our Lady, commonly known as the Rotunda of Mosta or Rotunda of St Marija Assunta ( shortened to as The Mosta Dome) is a Roman Catholic church in Mosta, Malta. It is the third largest unsupported dome in the world.
Built in the 19th century on the site of a previous church, it was designed by the Maltese architect Giorgio Grognet de Vassé.
Its dome is among the largest in the world, with an internal diameter of 37.2 metres (122 ft)[1][2]. The rotunda walls are nearly 9.1 metres (30 ft) thick[1]. The rotunda dome is the third-largest church dome in Europe and the ninth largest in the world.
Too bad it was closed when I was there so I could not go in.
Took many photos, with this one you see it from the side as well.
It is so huge it was not easy getting it all, an they were doing road construction.