National museum of science and technology "Leonardo da Vinci" in Milan. It might sound weird but there's a real submarine in there you can visit. Plus some other boats like the Luna Rossa AC cat or the "pig" slow torpedo.
There's a section about trains and trams as well!

challenge #5: where's that building on the left? (hint: not in France).
The symbol is so used and abused by right and far right group in Europe that you learn about it in 7th grade at worst. It's used in so many graffiti, probably because even nazis can paint it (swastikas are hard! so complex!)

challenge #4: ok google how is it called in english the fascio littorio?

challenge #3: you can easily find the graffiti origin and from there just search for far right related abandoned buildings in Croatia. Better if related to a certain nazi like dictator

challenge #2: be chronically online and you'll immediately recognize the gun from the Christchurch, NZ shooting. The hate symbol is one of the many you can find in any list, the law change is in the wikipedia page about the shooting

challenge #1: be online or even just consume mainstream media reporting on any far right event (or football matches) and you'll see those symbols all the times

Passer Italie, I think the english name is Italian Sparrow. it's a specie of sparrow typical of Italy and the islands nearby. It differs from the european or house sparrow by the top of the head, red instead of grey

Unrelated but of extreme interest for you (and very bad for russia and russian railways) www.isdb.org/project-proc...