Photos: The Pentagon, built starting on Sept. 11, 1941

Photos: The Pentagon, built starting on Sept. 11, 1941

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In 1941 -- 60 years to the day before the worst terrorist attack on American soil occurred on 9/11 -- ground was broken on the Pentagon. In tribute to that proud American symbol, Yahoo Homes is taking a look at the architecture of the Pentagon.Specifically, why in the world is it shaped like a pentagon? Click here to find out on our blog.

We put together this slideshow of the Pentagon as a companion to the blog post. The captions are all in quotation marks because they're quoted from the sources' own captions. All of the photos but the first one are from Flickr.

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