Largest Greenhouse?

Here in Charlotte we have a company called Metrolina Greenhouse that claims to have one of the largest greenhouses in the USA under one roof. It is quite large at 3 Million Sq Ft and they continue to expand. Metrolina supplies all those pretty flowers you see at all the Home Depots and Lowe's in VA, NC, SC, GA, FL, TN, AL, and FL. Here is an aerial pick of their facility: Do you have a larger greenhouse in your area? Post it. Their facility is highly automated, they have a neat website with movies that shows their growing process: http://www.metrolinagreenhouses.com >