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St Michael, Cornhill, is a medieval parish church in the City of London with pre-Norman Conquest parochial foundation. The medieval structure was lost in the Great Fire of London, and replaced by the present building, traditionally attributed to Sir Christopher Wren. The upper parts of the tower are by Nicholas Hawksmoor. The church was embellished by Sir George Gilbert Scott and Herbert Williams in the nineteenth century.St Michael, Cornhill, is a medieval parish church in the City of London with pre-Norman Conquest parochial foundation. The medieval structure was lost in the Great Fire of London, and replaced by the present building, traditionally attributed to Sir Christopher Wren. The upper parts of the tower are by Nicholas Hawksmoor. The church was embellished by Sir George Gilbert Scott and Herbert Williams in the nineteenth century.
Grade I listed. Link
Wikipedia: Link

Grade I listed buildings and structures are of exceptional, even international importance. There are over 6,000 in the country. Only 2.5% of listed buildings are Grade I listed.
In Scotland the classification is Category A
Index: 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