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 >>/48504/
> It's sad to see so many guns and tanks kept outdoors like that

These things are relatively weatherproof. Rust isn't big problem because metal is thick and may last for centuries, and guns wouldn't be used anyway. About bronze ones: as far as I know, this green oxide layer is good for preserving bronze.

Although main reason is "there is no other place to store them" of course. Especially when most of modern artillery isn't rare.

 >>/48507/
> That's a big mortar on the left.

It's M-240 mortar. Tracked version is known as Tulpan.

> The left vehicle: are those windshields painted green? 

It is metal sheet too. I guess it is used for museum purposes. Vehicle is Temp-S (NATO SS-12).

> Now this is entirely new to me. Any info on how it should have worked?

I also never knew about that thing. Here is photo of plate (in Russian though) - it says that spherical bullets were shot using water vapor pressure.  It could do 50 shots per second. But trials show that it was complex, big and unreliable.

English wiki article has a paragraph about it: https://en.wikipedia.org/wiki/Steam_cannon with not much info though.

> That old ship looks like a frigate.

It is replica of battleship "Poltava" (1712) built in 2018.