Why do the USA press and people insist that if it's famous in the US it's famous in the rest of the world? I only guess it looks like a pentagon but for non-English speaking countries (most of the world) I wouldn't say it's one of the most recognizable buildings.
Just do a quick google search (probably with anonymous browsing/VPN?) of "famous buildings" and you'll see it's nowhere near them.
Edit: if you can read this (English + HN) you and your friends/family are most likely not part of the rest of the world, but I agree that I messed up confusing famous with recognizable.