In which city can the largest bombard (a cannon or mortar used in medieval times) by caliber in the world be seen?

The Tsar Cannon is a large medieval artillery piece (known as a bombarda in Russian) on display on the grounds of the Moscow Kremlin. It is a monument of Russian artillery casting art, cast in bronze in 1586 in Moscow, by the Russian master bronze caster Andrey Chokhov. Mostly of symbolic impact, it was never used in a war. However the cannon bears traces of at least one firing. In the Guinness Book of Records it is the largest bombard by caliber in the world, and it is a major tourist attraction in the ensemble of the Moscow Kremlin.

The Tsar Cannon weighs 39.312 tonnes and has a length of 5.34 m (17.5 ft). Its bronze-cast barrel has an internal diameter of 890 mm (35.0 in) and an external diameter of 1,200 mm (47.2 in). The barrel has eight cast rectangular brackets for use in transporting the gun, which is mounted on a stylized cast iron gun carriage with three wheels.