Work begins on the <a href="https://en.wikipedia.org/wiki/Covering_of_the_Senne" id="mwkA" rel="mw:WikiLink" title="Covering of the Senne">covering of the Senne</a>, burying <a href="https://en.wikipedia.org/wiki/Brussels" id="mwkQ" rel="mw:WikiLink" title="Brussels">Brussels</a>'s primary river and creating the modern central boulevards.