Maria Callas and Mario del Monaco stared at me from a wall in a corridor. I locked eyes with the celebrated singers, their portraits on canvas were the first of various theatrical encounters when I toured the hidden halls of the famed Metropolitan Opera House earlier this year.
Read MoreMy Memories of the Twin Towers
The Skyscraper Museum in lower Manhattan has a section devoted to the World Trade Center that includes models of the Twin Towers, photos of the towers in various states of construction and completion, and extensive videos of the building project.
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