St Paul's Cathedral was designed by court architect Sir Christopher Wren and was completed in 1710. Its famous dome is one of the world's largest, measuring 111.3 meters high and is an iconic part of London's skyline. The dome reaches a height of 111 meters and weighs about 66,000 ton. Eight arches support the dome. On top of the dome is a large lantern with a weight of 850 ton.