|Covid-19|February 5 - Saint Thomas Episcopal Church and Rectory, Smithfield, Rhode Island, USA, designed by Thomas Alexander Tefft.
The Crystal Palace, home of the Great Exhibition, erected in Hyde Park, London to the design of Joseph Paxton.
Permanent Windsor Riverside railway station in England completed to the design of William Tite.
May 31 - Madonna dell'Archetto, Rome Italy.
July 25 - Holy Trinity Church, Bangalore, India.
October 1 - Alabama State Capitol, Montgomery, Alabama.
Osborne House on the Isle of Wight, England, designed by Prince Albert in consultation with builder Thomas Cubitt.
Dock Tower in Grimsby, England.
De Wachter, Zuidlaren, Netherlands.
Wat San Chao Chet, Bangkok, Thailand.
Stone Bastei Bridge, Saxony.
St. Stephen's Basilica in Budapest, Hungary, designed by Miklós Ybl.
Muhammad Amin Khan Madrasa in Khiva, Uzbekistan.
Hurstpierpoint College in England, designed by Richard Cromwell Carpenter.
Gottfried Semper - The Four Elements of Architecture, part 1
Edmund Sharpe - The Seven Periods of English Architecture.
Royal Gold Medal - Thomas Leverton Donaldson.
Grand Prix de Rome, architecture - Gabriel-Auguste Ancelet.
March 10 - Heinrich Wenck, Danish architect (died 1936)
March 26 - John Eisenmann, Cleveland-based US architect (died 1924)
June 29 - (Edmund) Peter Paul Pugin, English architect, son of Augustus Welby Pugin and half-brother of Edward Welby Pugin (died 1904)
October 13 - Samuel Beazley, British theatre architect and writer (born 1786)
November 18 - Jacob Ephraim Polzin, German Neoclassical architect (born 1778)
1851 in architecture Wikipedia
The year 1851 in architecture involved some significant architectural events and new buildings.