The present Saint Paul's Cathedral is believed to be the fifth cathedral on the site since 604.
The previous cathedral was destroyed during The Great Fire. Christopher Wren was commisioned to replace the old cathedral and that is the building we see today. The dome if 365 feet high and the cathedral is used for many state ceremonial services.
Saint Paul's miraculously survived the bombing of The Blitz and stood as a symbol of Britains defiance againt the enemy.