Editing 1843 in architecture (section)

===Buildings===
[[File:Arts Building, McGill University, Aug 31 2022.jpg|thumb|[[McGill University]]]]
* March 25 – The [[Thames Tunnel]] in [[London]], constructed by [[Isambard Kingdom Brunel]] and [[Marc Isambard Brunel]],<ref>{{cite book |last1=Burland |first1=J. B. |last2=Standing |first2=James R. |last3=Jardine |first3=F. M. |title=Building Response to Tunnelling: Case Studies from Construction of the Jubilee Line Extension, London |date=2001 |publisher=Thomas Telford |isbn=978-0-7277-3017-6 |page=120 |url=https://books.google.com/books?id=UgcHBtYPYy0C&pg=PA120 |language=en}}</ref> the oldest underwater tunnel in the world, opens to the public.<ref>{{cite web |title=Thames Tunnel (Plan and elevation of the Rotherhithe Tunnel - engineer Isambard Marc Brunel -annotated in ink) Opened 25 march 1843 {{!}} Royal Museums Greenwich |url=https://www.rmg.co.uk/collections/objects/rmgc-object-149873 |website=www.rmg.co.uk |access-date=17 December 2022}}</ref>
* [[Nelson's Column]] in [[London]], designed by [[William Railton]], is completed.
* [[McGill University]]'s original building, later known as the Arts Building, is completed in [[Montreal]] by architect [[John Ostell]].