The Paris Gun was the name given to a type of German long-range siege gun, several of which were used to bombard Paris during World War I. They were in service from March to August 1918. When the guns were first employed, Parisians believed they had been bombed by a high-altitude Zeppelin, as the sound of neither an airplane nor a gun could be heard. They were the largest pieces of artillery used during the war by barrel length, and qualify under the (later) formal definition of large-calibre artillery. Also called the "Kaiser Wilhelm Geschütz", they were often confused with Big Bertha, the German howitzer used against Belgian forts in the Battle of Liège in 1914; indeed, the French called them by this name as well. They were also confused with the smaller "Langer Max" cannon, from which they were derived. Although the famous Krupp-family artillery makers produced all these guns, the resemblance ended there.

Saint-Gervais-Saint-Protais is a Roman Catholic parish church located in the 4th arrondissement of Paris, on Place Saint-Gervais in the Marais district, east of City Hall. The current church was built between 1494 and 1657, on the site of two earlier churches; the facade, completed last, was the first example of the French baroque style in Paris. The organists of the church included Louis Couperin and his nephew François Couperin, two of the most celebrated composers and musicians of the Baroque period; the organ they used can still be seen today. The church contains remarkable examples of medieval carved choir stalls, stained glass from the 16th century, 17th century sculpture, and modern stained glass by Sylvie Gaudin and Claude Courageux. Saint-Gervais was a parish church until 1975, when it became the headquarters of the Monastic Fraternities of Jerusalem.