1840 in architecture

	… 1830; 1831; 1832; 1833; 1834; 1835; 1836; ; 1837; 1838; 1839; 1840; 1841; 1842; 1843; ; 1844; 1845; 1846; 1847; 1848; 1849; 1850 …;
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The year 1840 in architecture involved some significant architectural events and new buildings.