Impessive in every way are these two items on display within the Kremlin.
The Tsar Bell, built between 1733 and 1735 is claimed as the largest bell in the world. At around 6 mtrs high , with a diameter 6'6 mtrs, and weighing 202kg, I don't doubt that it is. The bell was broken during casting and has never been rung.
Similarly, the Tsar Cannon built in 1586 has never been discharged in conflict as it was never meant to be functional. It is also claimed to be the Worlds' biggest cannon, and weighing in at 39 tonnes, it probably is.
Incredible workmanship from as far back as 500+ years ago. Manual skills to be appreciated.