View source for 1820s

==== Northern Europe ====
* [[February 3]], [[1825]] &ndash; [[Vendsyssel-Thy]], once part of the [[Jutland]] peninsula that formed westernmost Denmark, becomes an island after a flood drowns its 1&nbsp;km wide [[isthmus]].
* [[September 27]], [[1825]] - The world's first modern railway, the [[Stockton and Darlington Railway]], opens with engineer [[George Stephenson]] driving the first public train pulled by the steam engine ''[[Locomotion No 1]]''.<ref name="Pocket On This Day">{{cite book|title=Penguin Pocket On This Day|publisher=Penguin Reference Library|isbn=0-14-102715-0|year=2006}}</ref>
* [[September 4]], [[1827]] &ndash; [[Finland]]: The [[Great Fire of Turku]] destroys 3/4 of the city, with many human casualties.