The Peace Arch spans the United States and Canadian border and commentates the signing of the Treaty of Ghent in 1814. The arch was dedicated in 1921 and was placed on the US National Register of Historic Places in 1996. Both countries flags fly on the monument. The Peace Arch and the associated area are considered to be an international park and one does not need to have a passport to visit it. The Peace Arch border crossing never closes.  It was a pretty quick passage for us, only about 45 minutes.