In 1930s the Russian army was obsessed with the idea of creating huge planes. At that time, they were proposed to have as many propellers as possible to help carry those huge flying fortresses into the air. Jet propulsion has not been implemented yet.
Not many photos were saved from that time, because of the high secrecy levels of such projects and because a lot of time passed already. Still, on the photo below you can see one of such planes – a heavy bomber K-7.
Hard to imagine this thing could get off the ground. I would have to see it to believe it.
The weaponry carried by this behemoth is shown in the last two pictures.
The K-7 first flew on 11 August 1933.