I believe the B-36 was even bigger than the B-52?
A gent I used to know who flew early jets for the RAF once told me a story of when he was flying a Vampire one day somewhere over the UK and happened to notice a silver glint in the distance. He went to take a look and came up alongside a B-36, which he described as the most impressive thing he'd ever seen in the air. After waving to the crew he was very perturbed when all the gun turrets suddenly swung round to point at him, and automatically pulled back on the stick to put some distance between him and them. Only afterwards did he tell himself that they probably weren't armed. Probably.