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There’s an abandoned MBTA tunnel under City Hall Plaza you may get a chance to tour

Under City Hall Plaza is an abandoned T tunnel that was in operation from the end of the 19th century to the early 1960s. On May 21, 100 people will have the rare chance to tour the tunnel.

Beneath the brutalist structure of Boston City Hall is a dusty abandoned train tunnel that was once a part of America’s first subway line, the Tremont Street Subway.

On May 21, in honor of Preservation Month, 100 people will have the rare opportunity to tour the cavernous space, which was in operation from the end of the 19th century to the early 1960s.

The Boston Landmarks Commission and city’s Archaeology Program worked for several months to make the tours happen, but city archeologist Joe Bagley said they never expected such an outpouring of interest.