Check out these photos of the two tallest men in the world from damncoolpics. According to the site, the guy in Mongolia measures in at 236.1 cm (about 7' 9'') and is the current Guinness book champ, while the other, a 253 cm tall Ukranian (about 8' 4''), hasn't registered with Guinness just yet. I've posted a couple of pics here, but you should definitely check out the link, via ettf.