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The John Hancock tower

Oct. 25, 1969: The Hub’s biggest hole in the ground in 1969 was the Hancock foundation in Copley Square.Jack Sheahan/Globe Staff

The groundbreaking ceremony for New England’s tallest building, the John Hancock Tower, was on Aug. 21, 1968. The 60-story minimalist structure was constructed with huge panes of reflective glass that proved to be a problem in the 1970s. Many panes of glass crashed to the ground with high wind speeds, causing street closures and huge safety concerns. After pane replacement and structural fixes that stabilized the tower, the actual cost of the construction nearly doubled the projected budget. — Leanne Burden Seidel and Lisa Tuite