John Hancock Tower

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This striking I.M. Pei edifice, famous for its beauty and infamous for falling glass panes, is Boston's tallest building. After terrorist attacks on the World Trade Center and the Pentagon, the popular 60th-floor observatory was permanently closed due to security concerns.This striking I.M. Pei edifice, famous for its beauty and infamous for falling glass panes, is Boston's tallest building. After terrorist attacks on the World Trade Center and the Pentagon, the popular 60th-floor observatory was permanently closed due to security concerns.