|Covid-19|Bocking Windmill, Essex, England.
7 Burlington Gardens, later Queensberry House, London, Giacomo Leoni's first design for England
Fort King George, along the Altamaha River in the modern-day US state of Georgia
Ruthven Barracks in Scotland completed
Jackson Square (New Orleans), New France
Nazarbaug Palace, Gujarat, India
Ellingen Residence in Ellingen, Bavaria completed in its Baroque form
Písek Gate, Prague, Czech Republic
Saint Paul the First Hermit Cathedral completed as parish church of San Pablo, Laguna, Philippines
Grand Prix de Rome, architecture: Philippe Buache.
March 5 - John Adam, architect, brother of Robert Adam and James Adam (died 1792)
date unknown - Thomas Sandby, draughtsman, watercolour artist, architect and teacher (died 1798)
Carlo Francesco Bizzaccheri, Italian architect (born 1656)
Anthony Deane, naval architect, shipbuilder and politician (born 1638)
1721 in architecture Wikipedia
The year 1721 in architecture involved some significant events.