1. The World Trade Center is a site for
various buildings in Lower
Manhattan, New York City, United
States. The original World Trade
Center was a complex of seven
buildings. It featured landmark twin
towers, which opened on April 4, 1973
and were destroyed in the September
11 attacks of 2001. The other buildings
in the complex were damaged in the
attacks and eventually destroyed.

2. The complex was designed in the early
1960s by Minoru Yamasaki and
Associates of Troy, Michigan, and Emery
Roth and Sons of New York
The North Tower was completed
in December 1972 and the South Tower
was finished in July 1973.

3. Architectural design
On September 20, 1962, the Port
Authority announced the selection
of Minoru Yamasaki as lead
architect and Emery Roth &
Sons as associate architects.
Yamasaki devised the plan to
incorporate twin towers;
Yamasaki's original plan called for
the towers to be 80 stories tall. To
meet the Port Authority's
requirement for 10,000,000 square
feet (930,000 m2)) of office space,
the buildings would each have to
be 110 stories tall

4. Yamasaki's design for the World Trade Center, unveiled
to the public on January 18, 1964, called for a square plan
approximately 208 feet (63 m) in dimension on each side

5. Construction
In March 1965, the Port Authority
began acquiring property at the
World Trade Center site. Demolition
work began on March 21, 1966, to
clear thirteen square blocks of low
rise buildings in Radio Row for
construction of the World Trade
Center. Groundbreaking for the
construction of the World Trade
Center took place on August 5, 1966.

6. In January 1967, the Port Authority
awarded $74 million in contracts to
various steel suppliers, and Karl
Koch was hired to erect the steel.
Tishman Realty & Construction was
hired in February 1967 to oversee
construction of the
project. Construction work began on
the North Tower inAugust 1968;
construction on the South Tower was
underway by January 1969. The
original Hudson Tubes, carrying PATH
trains into Hudson Terminal,

7. remained in service as elevated tunnels
during the construction process until
1971 when a new PATH station opened.
The topping out ceremony of 1 WTC
(North Tower) took place on December
23, 1970, while 2 WTC's ceremony
(South Tower) occurred later on July 19,
1971.The first tenants moved into the
North Tower in December 1970; the
South Tower accepted tenants
in January 1972. When the World Trade
Center twin towers were completed,
the total costs to the Port Authority
had reached $900 million. The ribbon
cutting ceremony was on April 4, 1973

8. NEW YORK CITY

9. On the morning of september 11, 2001,
terrorists from AL QUAEDA

10. Kidnapped two Boings 767, one from
America Airlans and other from United
Airlines

11. To crash them into both towers of the World
Trade Center in a suicide attack

12. The first plane hit the north tower and
the second one hit the south towers

13. The firs tower to collapse was the south tower. 2.606
people died in the attack becouse they were unable to
leave buidling. This attack is the worst terrorist action in
American soil.

14. To remember the victims of the attack the American
Built a Memorial. This place is now known as ground
ZERO and it is a tourist attractions.

15. END