kept inflated solely by air pressure. To enter the building, you have
to either come in a revolving door or through an air-lock system where
only one door can be opened at a time.
At one point during the weekend, we went out an "emergency" exit and
it seemed like we were going to be blown half-way across the parking
lot.
Here's a photo of the field just before a Twins game. After the
baseball game ended, they converted the stadium to football in about 3
hours.
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