Grand Cathedral designer

Doing some more research on the plane to Singapore I found it necessary to learn more about Sir Christopher Wren (1632 to 1723) . The architect of St Pauls Cathedral and many other great buildings. Also a scientist and one of the first to study the moon. An unfortunate life with both marriages ending with the death of his wives (was this a sign of the hard life staying free of disease?) . On his tombstone "Reader if you seek his memorial - look around you". I intend to! Here is Tom Tower in Oxford College.