Editing 1840 in architecture (section)

===Buildings opened===
[[File:Bristol Temple Meads railway station train-shed engraving.jpg|thumb|[[Isambard Kingdom Brunel|I. K. Brunel]]'s [[train shed]] at [[Bristol Temple Meads railway station|Bristol Temple Meads]]; engraving by [[John Cooke Bourne]]]]
* [[11 May]] – [[Wingfield railway station]] in [[England]], designed by [[Francis Thompson (architect)|Francis Thompson]], is opened.<ref>{{cite book|first=Gordon|last=Biddle |title=Britain's Historic Railway Buildings: an Oxford Gazetteer of Structures and Sites|publisher=Oxford University Press|year=2003|isbn=0-19-866247-5}}</ref>
* [[31 August]] – [[Bristol Temple Meads railway station]] in England, designed by [[Isambard Kingdom Brunel]], is opened.
* [[July Column]], [[Place de la Bastille]], [[Paris]], designed by [[Jean-Antoine Alavoine]] and [[Joseph-Louis Duc]], erected, incorporating [[Auguste Dumont]]'s ''Génie de la Liberté'' and [[bas-relief]]s by [[Antoine-Louis Barye]] and others.
* [[Khaplu Palace]] built.
* [[Old Patent Office Building]], [[Washington D.C.]], [[United States]] completed by [[Robert Mills (architect)|Robert Mills]].
* [[Forglen House]], [[Scotland]], designed by [[John Smith (architect)|John Smith]], is completed at about this date.<ref>{{Historic Environment Scotland|num=LB13603|desc=Forglen House|cat=A|access-date=2019-03-28}}</ref>