Here is a 1960's article boasting of what were to be the two tallest buildings in the world.
Here is a picture of a scale model by architect Minoru Yamasaki of the now iconic towers were to look from the 1964 worlds's fair.
Here is a promotional ad taken out in the New York Time circa 1971
Here are a couple of shots of the two towers being built by the structural engineering firm of Worthington, Skilling, Helle & Jackson.
At the time of their completion, the "Twin Towers" — the original 1 World Trade Center, at 1,368 feet and 2 World Trade Center, at 1,362 feet were the tallest buildings in the world.
Here they are in their full glory!
They were magnificent...