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Vent Building 1
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A monolithic concrete box with an artful cover rising above the waterfront district. More like overgrown utility closets than buildings, this is one of 5 ventilation structures in Metro Boston. They fulfill one essential purpose: providing power and fresh air to nearly 4 miles of underground roadway. Costing tens of millions of dollars each, the vent buildings, together with the ducts in the tunnels, make up the world's largest such system. Located on the Boston Harborwalknext to the Rolling Bridge Park, it only adds to the starkly industrial feel of the area.