The biggest calibre cannon in the world can be found in the United States. Known as the "Little David," this massive cannon was developed during World War II and was designed to be a super-heavy mortar for use in battles. The cannon has a calibre of 36 inches, making it one of the largest ever built. The "Little David" cannon was never actually used in combat, as it was still in the testing phase when the war ended. However, it remains a fascinating piece of military history and a testament to the engineering capabilities of the time. If you are interested in learning more about the "Little David" cannon, you can visit the National Museum of the United States Army in Fort Belvoir, Virginia. The museum has a comprehensive exhibit on the development and history of the cannon, as well as other military artifacts from throughout history. In addition to the "Little David," there are other large calibre cannons around the world that are worth exploring. One such example is the Schwerer Gustav, a German railway gun that was used during World War II. This cannon had a calibre of 31.5 inches and was capable of firing shells over long distances. If you want to learn more about the Schwerer Gustav or other large calibre cannons, you can visit military history museums or do some research online. There are many websites and resources available that can provide detailed information on these impressive weapons. Overall, the biggest calibre cannon in the world is the "Little David," located in the United States. This massive weapon is a reminder of the technological advancements made during World War II and the sheer power that these cannons possessed. If you have the opportunity, be sure to visit a military history museum to see these cannons up close and learn more about their fascinating history.

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