Moresnet is a village and sub-municipality of Plombières in the province of Liège, Wallonia, Belgium.

[3] Dony founded the Vieille Montagne mine in the municipality, and became Europe's largest producer of zinc.

[6] On 28 June 1919, all three parts were awarded to Belgium by the Treaty of Versailles,[7] and Prussian-Moresnet was renamed Neu-Moresnet.

During World War II, the castle was severely damaged, and parts have been demolished.

[10] The viaduct was destroyed twice during World War II, but is still in use by freight trains to Germany and Eastern Europe.