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St Paul's Cathedral is the Anglican cathedral on Ludgate Hill in the City of London and the seat of the Bishop of London. The present building dates from the 17th century.

It was designed by Sir Christopher Wren with the first stone of the cathedral laid in 1677.

Link

Sir Christopher Wren was Commissioned with rebuilding a number of the Churches destroyed in the City of London, by the Great Fire of London. His office rebuilt 51 churches, not all survive.
See Link for a list of churches.
Google map of their location: Link

Grade I listed buildings and structures are of exceptional importance and even internationally important. There are over 6000 in the country. Only 2.5% of listed buildings are Grade I listed.
In Scotland the classification is A
Index: Link