This is St. Paul's cathedral. The cathedral was designed by Christopher Wren to be re-built after the Great Fire of London in 1666. Even if you are not particularly religious, you can still go and view the beauty of the cathedral.
Aerial view: More than 15,000 photographs, including this picture of St Paul's Cathedral in London from March 1921, have been made freely available on the internet for the first time. www.britainfromabove.org.uk