It's old. Yesterday I was looking at the machinery the used to open the hangar doors. It is old rusty, has more rivets than welds. I don't think the main doors have opened in ages. It still is a site to see how big a building can be. Football fields could easily sit inside it. I have heard, but don't know for a fact that it sometimes rains/snows inside the hangar but not outside on some days.
Next door is a smaller hangar where the make and test all the cables for stopping jets on all of our aircraft carriers.
You can see the hangar on google earth, Joint Base McGuire, Fort Dix, and Lakehurst Naval. The hangar is on the edge of the Lakehurst border.
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Don't believe everything you read on the internet- George Washington.