One of the former Cherven Grods; in the XIV and XV centuries a town with a royal castle, the place of courts in Polish-Lithuanian border disputes. In 1413, during a congress of the Polish and Lithuanian nobility, King Władysław Jagiełło and the Grand Duke of Lithuania Vytautas concluded the union of the two countries. This fact is commemorated by the Union of Horodło mound, erected in 1861. The remains of the royal castle are earth embankments (called the Jagiellonian embankments) and stone lions, set in the market square. The most interesting monuments also include: a baroque parish church from 1739-58 and two wooden churches - a former Uniate church and a Polish Catholic church from the 1930s.