Mosta rotunda

The Church of the Assumption of Our Lady, commonly known as the Rotunda of Mosta is a Roman Catholic church in Mosta, Malta. It is the fourth largest unsupported dome in the world and the third largest in Europe.
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.
On April 9, 1942, during an afternoon air-raid, a SC500 kg general purpose Luftwaffe bomb pierced the dome (one 50kg bomb bounced off) and fell among a congregation of more than 300 people awaiting early evening mass. It did not explode.