Introduction to St. Paul's Cathedral: St. Paul's Cathedral is the fifth largest cathedral in the world, the largest cathedral in the UK, and the second largest domed church in the world. It was first established in 604 and has been destroyed and rebuilt many times. The famous British design master and architect Sir Christopher Wren completed the design of this greatest church in London at the end of the 17th century. It took a total of 45 years. years of hard work. The church is in Renaissance style, covered with a huge dome, about 111 meters high, 74 meters wide, 157 meters deep, and 34 meters in diameter. The top of the tower is an excellent place to overlook London. The wedding ceremony of Princess Diana and Prince Charles was held in 1981.