https://en.wikipedia.org/wiki/Paris_Gun
The Paris gun was used to shell Paris at a range of 120 km (75 mi). The distance was so far that the
Coriolis effect — the rotation of the Earth — was substantial enough to affect trajectory calculations. The gun was fired at an azimuth of 232 degrees (west-southwest) from Crépy-en-Laon, which was at a latitude of 49.5 degrees North.
A total of around 320 to 367 shells were fired, at a maximum rate of around 20 per day. The shells killed 250 people and wounded 620, and caused considerable damage to property. The worst incident was on 29 March 1918, when a single shell hit the roof of the
St-Gervais-et-St-Protais Church, collapsing the entire roof on to the congregation then hearing the Good Friday service. A total of 91 people were killed and 68 were wounded. The incident inspired
Romain Rolland to write his novel
Pierre et Luce.
The gun was taken back to Germany in August 1918 as Allied advances threatened its security. No guns were ever captured by the Allies. It is believed that near the end of the war they were completely destroyed by the Germans. One spare mounting was captured by American troops near
Château-Thierry, but the gun was never found; the construction plans seem to have been destroyed as well.