Rotunda of Mosta

The Church of the Assumption of Our Lady, commonly known as the Rotunda of Mosta or Rotunda of St Marija Assunta (sometimes 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 . The rotunda dome is the third-largest church dome in Europe and the ninth largest in the world.

Grongnet's plans were based on the Pantheon in Rome. Construction began in May 1833 and was completed in the 1860s. The original church was left in place while the Rotunda was built around it, allowing the local people to have a place of worship while the new church was being built. The church was officially consecrated the 15 October 1871.

Mosta bomb miracle

On April 9, 1942, during an afternoon air-raid, a 200 kg Luftwaffe bomb pierced the dome (two others bounced off) and fell among a congregation of more than 300 people awaiting early evening mass. It did not explode. Its replica is now on display inside the rotunda under the words Il-Miraklu tal-Bomba, 9 ta' April 1942 ().

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