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WORLD TRADE CENTER CONSTRUCTION 1968

Construction at World Trade Center in New York City on April 16, 1968. (KEYSTONE/AP Photo/Robert Kradin)

WORLD TRADE CENTER CONSTRUCTION 1968

Work crews during construction of the World Trade Center in New York City on April 16, 1968. (KEYSTONE/AP Photo/Robert Kradin)

WORLD TRADE CENTER CONSTRUCTION 1968

Construction at World Trade Center in New York City on April 16, 1968. (KEYSTONE/AP Photo/Robert Kradin)

WORLD TRADE CENTER CONSTRUCTION 1968

Steelworkers guide a 34 ton steel grillage into place 70 feet below street level at the site of the World Trade Center in New York, August 6, 1968. The grillage is a complex of steel constructed in three tiers and is the first of 28 that will support the core columns of the 1350 foot high north tower. The grillage is 11 feet wide, 15 feet long, and 7 feet high. (KEYSTONE/AP Photo/Anthony Camerano) (KEYSTONE/AP/Anthony Camerano)

WORLD TRADE CENTER CONSTRUCTION 1969

The new World Trade Center is shown under construction in New York City, Aug. 1969. It is located in lower Manhattan at Varick Street by the Hudson River. (KEYSTONE/AP Photo)

WORLD TRADE CENTER CONSTRUCTION 1969

WHS#32004: Looking up at the construction of the two towers of the World Trade Center. New York, New York, 1969. Wisconsin Historical Society/Courtesy Everett Collection. (KEYSTONE/Everett Collection/Wisconsin Historical Society)

WORLD TRADE CENTER CONSTRUCTION 1970

This view from the North tower of the World Trade Center shows construction of the center's South tower in New York, on Oct. 20, 1970. (KEYSTONE/AP Photo/Jim Wells)

WORLD TRADE CENTER CONSTRUCTION 1970

World Trade Center from the construction site in New York City on Oct. 20, 1970. (KEYSTONE/AP Photo/Jim Wells)

WORLD TRADE CENTER CONSTRUCTION 1971

A crane moves material at the construction area of the twin towers at the World Trade Center, in Lower Manhattan of New York City. This complex will house the New World Trade Mart, foreign trade offices, and the New York Stock Exchange when completed. This photo dated Feb. 11, 1971. (KEYSTONE/AP Photo).

USA WORLD TRADE CENTER 1970

The twin towers of the World Trade Center rise over the west side of Manhattan as construction of the 110th floor twin story World Trade Center Towers progresses, June 11, 1970. Beyond East River, background is Brooklyn. (KEYSTONE/Photopress-Archiv/AP/Str)

WORLD TRADE CENTER CONSTRUCTION 1970

The World Trade Center is shown under construction in late 1970 in New York's financial district. When the towers are complete, the north tower, foreground, will be 1,368 feet and the south tower, right, will be 1,362 feet. Both towers will be 110 stories tall. (KEYSTONE/AP Photo)

WORLD TRADE CENTER CONSTRUCTION 1971

Iron workers of the Carl Koch Erecting Company dismantle the last crane into sections small enough to be lowered safely over the side of the 1,350 foot south tower of the World Trade Center building in lower Manhattan, April 12, 1971. Four giant cranes were used to erect each tower building of the World Trade Center. (KEYSTONE/AP Photo)

WORLD TRADE CENTER CONSTRUCTION 1970

World Trade Center from the construction site in New York City on Oct. 20, 1970. (KEYSTONE/AP Photo/Jim Wells)

WORLD TRADE CENTER CONSTRUCTION 1970

This view shows the construction of one of the twin towers at the World Trade Center in lower Manhattan, New York City, on Oct. 20, 1970. In the background at right is the Empire State Building with its antenna. (KEYSTONE/AP Photo/Jim Wells)

WORLD TRADE CENTER CONSTRUCTION 1970

World Trade Center under construction in New York City, Oct. 20, 1970. (KEYSTONE/AP Photo/Jim Wells)

WORLD TRADE CENTER CONSTRUCTION 1970

The new World Trade Center is shown under construction at Varick Street by the Hudson River, New York City, Jan. 27, 1970. (KEYSTONE/AP Photo)

WORLD TRADE CENTER CONSTRUCTION 1970

World Trade Center from the construction site in New York City on Oct. 20, 1970. (KEYSTONE/AP Photo/Jim Wells)

WORLD TRADE CENTER CONSTRUCTION 1970

A 36-foot long, 4-ton column is hoisted atop the new world's tallest building, the World Trade Center, still under construction in New York City, Dec. 23, 1970. (KEYSTONE/AP Photo/Anthony Camerano)

WORLD TRADE CENTER CONSTRUCTION 1970

The new World Trade Center is shown under construction at Varick Street by the Hudson River, New York City, Jan. 27, 1970. (KEYSTONE/AP Photo)

WORLD TRADE CENTER CONSTRUCTION 1970

World Trade Center from the construction site in New York City on Oct. 20, 1970. (KEYSTONE/AP Photo/Jim Wells)

WORLD TRADE CENTER CONSTRUCTION 1971

The twin towers of the World Trade Center, under construction in lower Manhattan of New York City, will house the New World Trade Mart, foreign trade offices, and the New York Stock Exchange when completed. The 1350-foot North Tower Building, now the world's tallest building, overlooks the historic St. Paul's Church in the foreground. This photo is dated Feb.11, 1971. (KEYSTONE/AP Photo).

WORLD TRADE CENTER CONSTRUCTION 1970

A view of a construction worker as he works of World Trade Center building in 1970 in New York City. (KEYSTONE/AP Photo/Eddie Adams)

WORLD TRADE CENTER CONSTRUCTION 1969

WHS#32009: Two construction workers with hard hats at the World Trade Center. New York, New York, 1969. Wisconsin Historical Society/Courtesy Everett Collection. (KEYSTONE/Everett Collection/Wisconsin Historical Society)

WORLD TRADE CENTER CONSTRUCTION 1969

WHS#32005: A construction worker wearing a yellow hardhat, looks up at the bottom portion of the World Trade Center. New York, New York, 1969. Wisconsin Historical Society/Courtesy Everett Collection. (KEYSTONE/Everett Collection/Wisconsin Historical Society)

WORLD TRADE CENTER CONSTRUCTION 1970

A view of a construction worker as he works on the World Trade Center building in 1970 in New York City. (KEYSTONE/AP Photo/Eddie Adams)

WORLD TRADE CENTER CONSTRUCTION 1971

A construction worker guides a steel beam as it is lifted for the formal topping out ceremony of the south tower at the World Trade Center in lower Manhattan, July 19, 1971. The 110-story north tower, at right, was topped last December, making it the city's tallest building. (AP Photo)

WORLD TRADE CENTER CONSTRUCTION 1970

A 36-foot long, 4-ton column is hoisted atop the new world's tallest building, the World Trade Center, still under construction in New York City, Dec. 23, 1970. (KEYSTONE/AP Photo/Anthony Camerano)

WORLD TRADE CENTER CONSTRUCTION 1969

WHS#32003: A surveyor coducts work at the construction of the World Trade Center. He is at work before the building located at 210 Washington Street. New York, New York, 1969. Wisconsin Historical Society/Courtesy Everett Collection. (KEYSTONE/Everett Collection/Wisconsin Historical Society)

WORLD TRADE CENTER CONSTRUCTION 1969

WHS#31992: Construction workers gather to meet before beginning work during the construction of the World Trade Center. New York, New York, 1969. Wisconsin Historical Society/Courtesy Everett Collection. (KEYSTONE/Everett Collection/Wisconsin Historical Society)

WORLD TRADE CENTER CONSTRUCTION 1969

WHS#31961: Rear view of onlookers observing the construction of the World Trade Center towers. New York, New York, 1969. Wisconsin Historical Society/Courtesy Everett Collection. (KEYSTONE/Everett Collection/Wisconsin Historical Society)

WORLD TRADE CENTER CONSTRUCTION 1969

WHS#31990: Detail of the framework of the World Trade Center during construction. New York, New York, 1969. Wisconsin Historical Society/Courtesy Everett Collection. (KEYSTONE/Everett Collection/Wisconsin Historical Society)

WORLD TRADE CENTER CONSTRUCTION 1969

WHS#31991: Sign for Commuters Bar and Restaurant with the construction of the World Trade Center building in the background. New York, New York, 1969. Wisconsin Historical Society/Courtesy Everett Collection. (KEYSTONE/Everett Collection/Wisconsin Historical Society)

WORLD TRADE CENTER CONSTRUCTION 1970

A view of the construction of the 110th floor twin story World Trade Center Towers in 1970 in New York City. This is the first building of the 21st century, said the architect, as he referred to the World Trade Center, now in its fourth year of construction and scheduled to be completed by the end of 1971. (KEYSTONE/Str) === ===

WORLD TRADE CENTER CONSTRUCTION 1970

Geo. hist., USA, Staedte, New York, Gebaeude, World Trade Center, erbaut: 1966 - 1973 von Minoru Yamasaki, die beiden Twin Tower von Hudson River aus gesehen, um 1970, geography / travel, USA, New York, buildings, World Trade Center, built: 1966 - 1973, design by Minoru Yamasaki, both Twin Tower, exterior view, view from Hudson River, circa 1970, historic, historical, 20th century, North America, skyline, Manhattan, WTC, city view, building, under construction, construction site, skyscraper, architecture, 1970s (KEYSTONE/INTERFOTO/MILLER)

WORLD TRADE CENTER CONSTRUCTION 1970

This general view shows the World Trade Center twin towers as construction continues on the buildings at Church Street between Vesey and Liberty Streets in lower Manhattan, New York City, on Jun 13, 1970. This view is looking southwest toward New Jersey. (KEYSTONE/AP Photo/Marty Lederhandler)

USA WORLD TRADE CENTER

Der erste Turm des World-Trade-Centers (hinten) in New York (USA), im Bau auf einer Hoehe von 104 Stockwerken, aufgenommen am 10. Oktober 1970. Das Gebaeude wurde am Dienstag, 11. September 2001, bei einem Attentat mittels zweier Passagierflugzeuge, die in beide Tuerme stuerzten, komplett zerstoert. (KEYSTONE/DPA/Port Authority of NYC/A.Belvar) === , === [008101_2]

WORLD TRADE CENTER CONSTRUCTION 1971

This aerial view shows the near-completed twin towers of the World Trade Center in lower Manhattan, May 17, 1971. The building at left is the north tower, and at right is the south tower. (KEYSTONE/AP Photo)

USA WORLD TRADE CENTER

A view of the construction of the 110th floor twin story World Trade Center Towers in 1970 in New York City. (KEYSTONE/DPA/Str) === ===

USA NEW YORK FREIHEITSSTATUE

View of Manhattan, the Statue of Liberty is at the front right, to the left is the World Trade Center, New York City, November 11, 1971. CSU Archives/Courtesy Everett Collection (KEYSTONE/Everett Collection/)

WORLD TRADE CENTER CONSTRUCTION 1973

The Twin Towers of the World Trade Center in lower Manhattan are shown on April 3, 1973, one day before the dedication. The 110-story towers are the tallest buildings in the world. At right is 1 World Trade Center on the north at 1,368 feet, and at left is 2 World Trade Center on the south at 1,362 feet. (KEYSTONE/AP Photo/David Pickoff)

WORLD TRADE CENTER CONSTRUCTION 1973

Historic St. Paul's Chapel, built in 1766, on Lower Broadway in the Financial District. Behind looms the Twin Towers of the World Trade Center. Manhattan, New York City, May 1973. (BSLOC_2015_2_38) (KEYSTONE/Everett Collection/)

USA. BUSINESSMEN IN HELICOPTER.

USA. New York City. 1973. Business people fly to work in a helicopter in Downtown Manhattan with the World Trade Center in the background. (KEYSTONE/Magnum Photos/Burt Glinn)

WORLD TRADE CENTER CONSTRUCTION 1973

Geo. hist., USA, Staedte, New York, Bruecken, Brooklyn Bridge ueber den East River, Blick Richtung Manhattan, 1970er Jahre, Architektur, Bruecke, Twin Towers, World Trade Center, Haengebruecke, Wolkenkratzer, 70er, Nordamerika, Amerika, (KEYSTONE/INTERFOTO/Luitpold Baumann)

WORLD TRADE CENTER CONSTRUCTION 1973

Manhattan landfill and construction site. North of the World Trade Center is an extended landfill into the Hudson River. Port facilities moved to Brooklyn and New Jersey where there was space to develop modern port facilities opening the Manhattan waterfront for residential development and parks. May 1973. (KEYSTONE/Everett Collection/)

WORLD TRADE CENTER CONSTRUCTION 1973

The two towering structures of The World Trade Center jut into the sky in lower Manhattan, New York, Tuesday, April 3. 1973. Officials Wednesday will formally dedicate the 110-story, 1,350-feet buildings. Officials say that about 50,000 people will work at the Center, which now houses some 300 international trade firms. The tall building at left in the background is the Woolworth Building and at right is the Transportation Building. (KEYSTONE/AP Photo/David Pickoff)

MINORU YAMASAKI

Minoru Yamasaki, the chief architect of the World Trade Center that once stood in New York City. (KEYSTONE/SCIENCE PHOTO/Hans Namuth) === ===

WORLD TRADE CENTER CONSTRUCTION 1972

FILE - This 1972, file photo, shows the World Trade Center in New York. The twin towers stood as New York's tallest until the terrorist attacks of Sept. 11, 2001, when two planes crashed into the World Trade Center causing the twin 110-story towers to collapse, making the Empire State Building the tallest once again. (KEYSTONE/AP Photo/File)

WORLD TRADE CENTER MODELL 1965

An eight foot model of the World Trade Center building which was unveiled in 1965 before construction began in 1968...New York, USA - 15th February 1965 (KEYSTONE/UNITED ARCHIVES)