I've again visited city known as Sankt-Peterburg few weeks ago, and got like thousand of photos from different museums and historical places. Posting everything wouldn't be good for that, so it is small IWO about Artillery Museum: https://en.wikipedia.org/wiki/Military_Historical_Museum_of_Artillery,_Engineers_and_Signal_Corps

It is historical building from 19th century that features large outdoor exhibition of artillery pieces and multiple indoor ones about different historical periods. Here are photos:

1. Overall partial view of courtyard
2, 3, 4. Old guns and mortars from all around the world. There are Prussian, Ottoman, Russian, English and other guns from 16-18th century. It was times when guns were rare and precious handmade things, so they often have good art style, not like modern industrial ones. Humanity surely has fallen.