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World Trade Center Timeline

(1966 - Present)

The World Trade Center was a complex of seven buildings in Lower Manhattan, New York City, anchored by the iconic Twin Towers. Opened in 1973, it served as a global hub for commerce and finance for nearly three decades before its destruction in the September 11, 2001 terrorist attacks. The site, known as Ground Zero, has since been rebuilt with new towers, including One World Trade Center, along with memorials honoring the victims. Less

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Planning and Construction

Port Authority proposes World Trade Center complex

Mar 10, 1961

The Port of New York Authority selected a site in Lower Manhattan near the Hudson River for the World Trade Center, envisioning a massive office complex to promote international trade and revitalize downtown Manhattan.

Image source: World Trade Center (1973–2001)

Port Authority proposes World Trade Center complex

Minoru Yamasaki named lead architect

Sep 20, 1962

Detroit-based architect Minoru Yamasaki was chosen as the lead architect for the World Trade Center, working with Emery Roth & Sons. His design featured twin 110-story towers, the tallest buildings ever planned at the time.

Image source: Minoru Yamasaki

Minoru Yamasaki named lead architect

Slurry wall construction completed

1966 - 1967

A innovative slurry wall method was used to construct 'the Bathtub,' a deep waterproof perimeter that kept Hudson River water out of the excavation site, a technique that would later prove crucial after September 11, 2001.

Image source: Bathtub

Slurry wall construction completed

Construction begins on World Trade Center site

Aug 5, 1966

Ground was broken for the World Trade Center, requiring the demolition of Radio Row, an electronics district, and the excavation of over one million cubic yards of earth to create the foundation and a large underground plaza.

North Tower opens for tenants

Dec 15, 1970

The North Tower welcomed its first tenants even while construction continued on other parts of the complex, marking the operational beginning of the World Trade Center despite initial difficulty leasing space.

North Tower topping out

Dec 23, 1970

The North Tower, One World Trade Center, reached its full height of 1,368 feet when its final structural steel was installed, making it briefly the tallest building in the world before Sears Tower surpassed it.

Image source: 1 World Trade Center (1970–2001)

North Tower topping out

South Tower topping out

Jul 19, 1971

The South Tower, Two World Trade Center, topped out at 1,362 feet, completing the structural framework of the iconic Twin Towers that would dominate the New York skyline for nearly three decades.

Image source: 2 World Trade Center (1971–2001)

South Tower topping out

Official dedication ceremony held

Apr 4, 1973

The World Trade Center was officially dedicated in a ribbon-cutting ceremony, with the Twin Towers becoming the tallest buildings on Earth at the time and a defining symbol of New York City's skyline.

Operations and Milestones

Philippe Petit performs high-wire walk between towers

Aug 7, 1974

French tightrope walker Philippe Petit performed an unauthorized high-wire walk between the Twin Towers, eight times back and forth, 1,350 feet above the ground, in a feat celebrated as 'the artistic crime of the century.'

Image source: Philippe Petit

Philippe Petit performs high-wire walk between towers

Fire breaks out in North Tower offices

Feb 13, 1975

A three-alarm fire broke out on the 33rd floor of the North Tower, spreading through floor openings due to the lack of firestops. The blaze caused significant damage but resulted in no deaths, prompting improvements to fire safety systems.

Vista Hotel bombing kills six people

Mar 13, 1975

A bomb exploded in the Vista International Hotel at the World Trade Center, killing six people. The blast was caused by an explosive device hidden in a stairwell, foreshadowing later security concerns at the complex.

Image source: Marriott World Trade Center

Vista Hotel bombing kills six people

Owen Quinn parachutes off North Tower

Jul 22, 1975

Stuntman Owen Quinn parachuted from the roof of the North Tower, landing in the plaza below, in one of several daring stunts involving the towers during their history.

World Trade Center observation decks open

Dec 1975

The Top of the World observatory opened on the 107th floor of the South Tower along with Windows on the World restaurant in the North Tower, drawing millions of visitors annually to enjoy panoramic views of the city.

Image source: World Trade Center (1973–2001)

World Trade Center observation decks open

George Willig climbs South Tower exterior

May 26, 1977

Mountain climber George Willig scaled the exterior of the South Tower using custom climbing devices attached to the building's bolt tracks, completing the ascent in about three hours and earning the nickname 'Human Fly.'

1993 World Trade Center truck bombing

Feb 26, 1993

Terrorists detonated a truck bomb beneath the North Tower, killing six people and injuring over 1,000. The attack by al-Qaeda-affiliated militants created a crater several stories deep and exposed vulnerabilities in the complex's security.

Image source: 1993 World Trade Center bombing

1993 World Trade Center truck bombing

Windows on the World reopens after bombing repairs

1996

After extensive renovations following the 1993 bombing, the famed Windows on the World restaurant reopened on the top floors of the North Tower, once again becoming a premier dining destination and symbol of resilience.

Image source: Windows on the World

Windows on the World reopens after bombing repairs

World Trade Center reaches peak occupancy

Jan 2001

By early 2001, the World Trade Center complex housed approximately 430 businesses employing around 50,000 workers, with major tenants including financial firms, government agencies, and international companies.

September 11 Attacks

Seven World Trade Center collapses

Sep 11, 2001

At 5:21 p.m., 47-story Seven World Trade Center collapsed after burning unattended for hours, ignited by debris from the tower collapses, becoming the third skyscraper destroyed in the attacks.

Image source: 7 World Trade Center

Seven World Trade Center collapses

North Tower collapses

Sep 11, 2001

At 10:28 a.m., the North Tower collapsed after burning for 102 minutes, destroying the remaining structure of the complex and killing hundreds more, including many firefighters who had entered to rescue survivors.

Image source: Collapse of the World Trade Center

North Tower collapses

South Tower collapses

Sep 11, 2001

At 9:59 a.m., after burning for 56 minutes, the South Tower collapsed in under ten seconds, its structure fatally weakened by jet fuel fires and impact damage, crushing or burying hundreds including first responders.

Evacuation of the towers underway

Sep 11, 2001

Thousands of occupants descended crowded stairwells while firefighters climbed upward. Remarkably orderly evacuations saved thousands of lives, aided by lessons learned from the 1993 bombing, though many remained trapped above impact zones.

Image source: Casualties of the September 11 attacks

Evacuation of the towers underway

Flight 175 crashes into South Tower

Sep 11, 2001

At 9:03 a.m., United Airlines Flight 175 struck floors 77 through 85 of the South Tower, broadcast live to millions worldwide, confirming that America was under coordinated terrorist attack.

Image source: United Airlines Flight 175

Flight 175 crashes into South Tower

Flight 11 crashes into North Tower

Sep 11, 2001

At 8:46 a.m., Flight 11 crashed into floors 93 through 99 of the North Tower, killing everyone aboard and hundreds inside the building, severing all stairways above the impact zone and trapping over a thousand people.

Image source: American Airlines Flight 11

Flight 11 crashes into North Tower

Hijackers seize American Airlines Flight 11

Sep 11, 2001

Five al-Qaeda hijackers took control of American Airlines Flight 11 shortly after it departed Boston for Los Angeles, turning the aircraft toward New York City as part of a coordinated terrorist plot.

Rebuilding and Memorial

Rescue and recovery operations begin at Ground Zero

Sep 12, 2001 - May 30, 2002

Massive rescue and recovery operations commenced at the site known as Ground Zero, where thousands of workers spent months clearing 1.8 million tons of debris and searching for survivors and remains.

Image source: Rescue and recovery effort after the September 11 attacks on the World Trade Center

Rescue and recovery operations begin at Ground Zero

'Tribute in Light' memorial illuminates skyline

Mar 11, 2002

Two beams of light soaring skyward were first illuminated six months after the attacks, evoking the fallen towers. The temporary installation became an annual tradition displayed each September 11.

Image source: Tribute in Light

'Tribute in Light' memorial illuminates skyline

Cleanup at Ground Zero officially declared complete

May 30, 2002

Eight months after the attacks, the cleanup of Ground Zero was formally concluded in a ceremony marked by the removal of the last steel column, allowing planning for reconstruction to move forward.

Image source: World Trade Center site

Cleanup at Ground Zero officially declared complete

Daniel Libeskind wins master plan competition

Feb 27, 2003

Architect Daniel Libeskind's design concept won the competition to rebuild the World Trade Center site, featuring a memorial preserving the tower footprints and a symbolic 1,776-foot spire echoing the year of American independence.

National September 11 Memorial opens

Sep 11, 2011

On the tenth anniversary of the attacks, the memorial opened featuring two reflecting pools set within the original tower footprints, surrounded by bronze parapets inscribed with the names of the 2,983 victims.

Image source: National September 11 Memorial & Museum

National September 11 Memorial opens

Four World Trade Center opens

Nov 13, 2013

Four World Trade Center, designed by Fumihiko Maki, opened as the first completed tower of the rebuilt complex, housing the Port Authority's headquarters and anchoring the southeastern corner of the site.

Image source: 4 World Trade Center

Four World Trade Center opens

September 11 Museum opens to public

May 21, 2014

The National September 11 Museum opened at the World Trade Center site, housing artifacts including recovered steel, personal effects of victims, and remnants such as the Last Column and Survivor Staircase.

One World Trade Center opens

Nov 3, 2014

One World Trade Center, the tallest building in the Western Hemisphere at 1,776 feet, opened for business, symbolizing New York's resilience and the rebirth of the Lower Manhattan skyline.

Image source: One World Trade Center

One World Trade Center opens

Oculus transportation hub opens

Mar 4, 2016

Santiago Calatrava's striking Oculus transit hub opened, connecting PATH trains and subway lines. Its white ribbed design resembles a dove in flight, serving over 250,000 daily commuters and visitors.

Image source: World Trade Center station (PATH)

Oculus transportation hub opens

Three World Trade Center opens

Jun 11, 2018

Three World Trade Center, an 80-story tower designed by Richard Rogers, opened as the fifth-tallest building in New York City, further restoring the density and vitality of the redeveloped complex.

Image source: 3 World Trade Center

Three World Trade Center opens

St. Nicholas Greek Orthodox Church reconsecrated

Dec 6, 2021

The St. Nicholas Greek Orthodox Church, which was destroyed on September 11, 2001, was reconsecrated after being rebuilt at the World Trade Center site in a new Byzantine-inspired design, restoring a house of worship lost in the attacks.

Image source: St. Nicholas Greek Orthodox Church (Manhattan)

St. Nicholas Greek Orthodox Church reconsecrated

Key Facts

  1. Construction of the original World Trade Center began in 1966, and the Twin Towers officially opened on April 4, 1973, briefly becoming the tallest buildings in the world at 110 stories each.
  2. On February 26, 1993, terrorists detonated a truck bomb beneath the North Tower, killing six people and injuring over a thousand in the first major attack on the complex.
  3. On September 11, 2001, hijacked airliners struck both Twin Towers, causing their collapse and killing nearly 3,000 people in the deadliest terrorist attack in history.
  4. The National September 11 Memorial & Museum opened on the site (known as Ground Zero) in 2011, featuring twin reflecting pools set within the footprints of the original towers.
  5. One World Trade Center, also called Freedom Tower, was completed in 2014 and stands 1,776 feet tall, making it the tallest building in the Western Hemisphere.

Source

This World Trade Center timeline was generated with the help of AI, using information found on the internet.

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