Huge Windows at Boeing's Airplane Assembly Plant

Google Street View

Here is an image from Flickr (by Maurice King) taken from height;

Vastness of the windows can be gauged from close up Google Street View shown below. (Notice the size of cars in front of the window.)

Google Street View

Boeing's assembly plant located in  Everett, Washington is the largest building in the world and Boeing 747s, 767s, 777s, and the new 787 Dreamliner are assembled here.

The building also boasts of huge glass windows which can seen in the Google Street Views above;

Location: Boeing Freeway, Everett, Washington, USA

Source of info: Wikipedia