The Sphere

America's Response Monument, subtitled De Oppresso Liber, is a life-and-a-half scale bronze statue in Liberty Park overlooking the National September 11 Memorial & Museum in New York City. Unofficially known as the Horse Soldier Statue, it is the first publicly accessible monument dedicated to the United States Special Forces. It was also the first monument near Ground Zero to recognize heroes of the September 11 terrorist attacks.The statue was conceived by sculptor Douwe Blumberg and first sold in 2003 as a small-scale, 18 inches (460 mm) version. In April 2011, an anonymous group of Wall Street bankers who lost friends in the 9/11 attacks commissioned a large, 16 feet (4.9 m) tall version. It was dedicated on Veteran's Day, November 11, 2011, in a ceremony led by Vice President Joe Biden and Lt. Gen. John Mulholland, commander of Task Force Dagger and U.S. Army Special Operations Command during Operation Enduring Freedom.The statue commemorates the service members of America's Special Operations forces and their response to 9/11, including those who fought during the first stages of the Afghanistan war. This operation led to the initial defeat of the Taliban in Afghanistan, although the Taliban would ultimately be victorious following their 20-year-long war with the United States.

The St. Nicholas Greek Orthodox Church, officially the St. Nicholas Greek Orthodox Church and National Shrine, is a church and shrine under construction in the World Trade Center in Manhattan, New York City. It is administered by the Greek Orthodox Archdiocese of America and is being developed by the Port Authority of New York and New Jersey, based on the design of Spanish architect Santiago Calatrava. The church is set to be completed in April 2022, coinciding with the Orthodox Holy Week, and will be consecrated July 4, 2022.St. Nicholas will replace the original church of the same name that was destroyed during the September 11 attacks in 2001—the only house of worship, and only building outside the original World Trade Center complex, to be completely destroyed. The new church is located in Liberty Park, overlooking the National September 11 Memorial & Museum. Its architecture draws from Byzantine influences, namely the Church of the Savior and the Hagia Sophia in Istanbul, as well as from the Parthenon in Athens. In addition to serving as a Greek Orthodox parish, St. Nicholas is officially planned as a "House of Prayer for all people" that will function as a national shrine and community center, incorporating a secular bereavement space, social hall, and various educational and interfaith programs.Initially scheduled to open in 2016, St. Nicholas' rebuilding effort was beset by delays, cost overruns, and claims of financial impropriety. In 2019, the nonprofit Friends of St. Nicholas was founded to help complete the project, which continued under the auspices of the newly elected Archbishop Elpidophoros. The church was partially opened for a memorial service commemorating the 20th anniversary of the September 11 attacks.

Liberty Park is a one-acre (4,000 m2) elevated public park at the World Trade Center in Manhattan, New York City, overlooking the National September 11 Memorial & Museum in Lower Manhattan. The park, which opened on June 29, 2016, is located above the World Trade Center's Vehicular Security Center. The St. Nicholas National Shrine is located within the park, as well as Fritz Koenig's The Sphere, the iconic sculpture salvaged from the World Trade Center site. Another statue, America's Response Monument, is also located in the park.

The Tribute in Light is an art installation created in remembrance of the September 11 attacks. It consists of 88 vertical searchlights arranged in two columns of light to represent the Twin Towers. It stands six blocks south of the World Trade Center on top of the Battery Parking Garage in New York City. Tribute in Light began as a temporary commemoration of the attacks in early 2002, but it became an annual event, currently produced on September 11 by the Municipal Art Society of New York. The Tribute in Light was conceived by artists John Bennett, Gustavo Bonevardi, Richard Nash Gould, Julian LaVerdiere, and Paul Myoda, and lighting consultant Paul Marantz.On clear nights, the lights can be seen from over 60 miles (97 km) away, visible in all of New York City and most of suburban Northern New Jersey and Long Island. The lights can also be seen in Fairfield County, Connecticut, as well as Westchester, Orange, and Rockland counties in New York.The two beams cost approximately $1,626 (assuming $0.11 per kWh) to run for 24 hours. The 88 xenon spotlights (44 for each tower) each consume 7,000 watts. As of 2011, the annual cost for the entire project was about half a million dollars.Due to the COVID-19 pandemic and the perceived need for social distancing, it was originally announced that the installation would not light up on the 19th anniversary of the attacks in September 2020, for the first time since its creation. New York Governor Andrew Cuomo later announced that the state would provide health care personnel and supervision to allow the tribute to be held as scheduled.

130 Cedar Street, formerly known as the Green Exchange Building, is a mid-rise building in the Financial District of Lower Manhattan, New York City. It is located between Cedar Street and Albany Street running along Washington Street, sharing a block with 90 West Street. It was built in 1931 and was designed by Renwick, Aspinwall & Guard.

United Airlines Flight 175 was a domestic passenger flight that was hijacked by five al-Qaeda terrorists on September 11, 2001, as part of the September 11 attacks. The flight's scheduled plan was from Logan International Airport, in Boston, Massachusetts, to Los Angeles International Airport, in Los Angeles, California. The Boeing 767-200 aircraft was deliberately crashed into the South Tower of the World Trade Center in New York City, killing all 65 people aboard and an unknown number in the building's impact zone. Approximately thirty minutes into the flight, the hijackers forcibly breached the cockpit and overpowered the captain and first officer, allowing lead hijacker and trained pilot Marwan al-Shehhi to take over the controls, after murdering Captain Victor Saracini from Yardley, Pennsylvania and First Officer Michael Horrocks from Glen Mills, Pennsylvania. Unlike Flight 11, whose transponder was turned off, Flight 175's transponder was visible on New York Center's radar, which depicted the aircraft's deviation from its assigned flight path for four minutes before air traffic controllers took notice at 08:51 EDT. Thereafter, they made several unsuccessful attempts to contact the cockpit. Several passengers and crew members aboard made phone calls to family members and relayed information regarding the hijackers and casualties suffered by passengers and crew. The aircraft crashed into Tower Two (the South Tower) of the World Trade Center at 09:03. The Flight 175 hijacking was coordinated with that of American Airlines Flight 11, which struck the upper floors of Tower One (the North Tower) 17 minutes earlier. The crash of Flight 175 into the South Tower was the only impact televised live around the world. The crash and subsequent fire caused the South Tower to collapse 56 minutes later at 09:59, resulting in hundreds of additional casualties. During the recovery effort at the World Trade Center site, workers uncovered and identified remains from some Flight 175 victims, but many other body fragments could not be identified.

90 West Street (previously known as the West Street Building and the Brady Building) is a 23-story residential building in the Financial District of Lower Manhattan in New York City. Located on West Street just south of the World Trade Center, the building was designed by Cass Gilbert, with Gunvald Aus and Burt Harrison as structural engineers, and John Peirce as general contractor. It was erected for the West Street Improvement Corporation, led by transportation magnate Howard Carroll. The Gothic styling and ornamentation of 90 West Street served to emphasize its height. The design combined elements of the three-section "classical column" arrangement of 19th-century buildings with the "romantic tower" of Gilbert's later structures such as the Woolworth Building. Its waterfront site necessitated the installation of pilings deep into the ground. Other features included a terracotta facade with granite at the two-story base, as well as terracotta fireproofing inside the building. The building's design was widely praised when it was originally completed. The building is a New York City designated landmark and listed on the National Register of Historic Places. 90 West Street was built in 1905–1907 as an office building called the West Street Building. "The Garret Restaurant", on the structure's top floors, was marketed as the highest restaurant in the world. The building underwent numerous ownership changes in the 20th century, and was known after its long-term owner, Brady Security and Realty Corporation, during the middle of the century. Following the collapse of the adjacent World Trade Center in the September 11, 2001, attacks, the West Street Building was severely damaged. The building was subsequently extensively refurbished and it reopened as a residential building called 90 West in 2005.

The Deutsche Bank Building (formerly Bankers Trust Plaza) was a 39-story office building located at 130 Liberty Street in Manhattan, New York City, adjacent to the World Trade Center site. The building opened in 1974 and closed following the September 11 attacks in 2001, due to contamination that spread from the collapse of the South Tower. The structure was designed by Shreve, Lamb & Harmon, which also designed the Empire State Building. The building was purchased by Deutsche Bank when it acquired Bankers Trust in 1998. It was part of the skyline of Lower Manhattan, and was demolished between 2007 and 2011. 5 World Trade Center will eventually replace the building, expanding the ground space on which the World Trade Center stands, as this land was not part of the original World Trade Center.

Hotel Attraction was a proposal by architect Antoni Gaudí for a skyscraper in Lower Manhattan, New York City.

Construction of New York City's One World Trade Center was deferred until 2006 because of disputes between the Port Authority of New York and New Jersey and the developer. Tishman Realty & Construction is the selected builder. The building reached ground level on May 17, 2008, and was topped out on May 10, 2013. One World Trade Center opened to tenants on November 3, 2014, and One World Observatory opened to the public on May 28, 2015.

The construction of the first World Trade Center complex in New York City was conceived as an urban renewal project to help revitalize Lower Manhattan spearheaded by David Rockefeller. The project was developed by the Port Authority of New York and New Jersey. The idea for the World Trade Center arose after World War II as a way to supplement existing avenues of international commerce in the United States. The World Trade Center was originally planned to be built on the east side of Lower Manhattan, but the New Jersey and New York state governments, which oversee the Port Authority, could not agree on this location. After extensive negotiations, the New Jersey and New York state governments agreed to support the World Trade Center project, which was built at the site of Radio Row in the Lower West Side of Manhattan, New York City. To make the agreement acceptable to New Jersey, the Port Authority agreed to take over the bankrupt Hudson & Manhattan Railroad, which brought commuters from New Jersey to the Lower Manhattan site and, upon the Port Authority's takeover of the railroad, was renamed PATH. The Port Authority hired architect Minoru Yamasaki, who came up with the specific idea for twin towers. The towers were designed as framed tube structures, which provided tenants with open floor plans, uninterrupted by columns or walls. This was accomplished using numerous closely spaced perimeter columns to provide much of the strength to the structure, along with gravity load shared with the core columns. The elevator system, which made use of sky lobbies and a system of express and local elevators, allowed substantial floor space to be freed up for use as office space by making the structural core smaller. The design and construction of the World Trade Center, most centrally its twin towers, involved many other innovative techniques, such as the slurry wall for digging the foundation, and wind tunnel experiments. Construction of the World Trade Center's North Tower began in August 1968, and the South Tower in 1969. Extensive use of prefabricated components helped to speed up the construction process. The first tenants moved into the North Tower in December 1970 and into the South Tower in January 1972. Four other low-level buildings were constructed as part of the World Trade Center in the early 1970s, and the complex was mostly complete by 1973. A seventh building, 7 World Trade Center, was opened in 1987.

The National September 11 Memorial & Museum (also known as the 9/11 Memorial & Museum) is a memorial and museum in New York City commemorating the September 11, 2001 attacks, which killed 2,977 people, and the 1993 World Trade Center bombing, which killed six. The memorial is located at the World Trade Center site, the former location of the Twin Towers that were destroyed during the September 11 attacks. It is operated by a non-profit institution whose mission is to raise funds for, program, and operate the memorial and museum at the World Trade Center site. A memorial was planned in the immediate aftermath of the attacks and destruction of the World Trade Center for the victims and those involved in rescue and recovery operations. The winner of the World Trade Center Site Memorial Competition was Israeli-American architect Michael Arad of Handel Architects, a New York- and San Francisco-based firm. Arad worked with landscape-architecture firm Peter Walker and Partners on the design, creating a forest of swamp white oak trees with two square reflecting pools in the center marking where the Twin Towers stood. In August 2006, the World Trade Center Memorial Foundation and the Port Authority of New York and New Jersey began heavy construction on the memorial and museum. The design is consistent with the original master plan by Daniel Libeskind, which called for the memorial to be 30 feet (9.1 m) below street level—originally 70 feet (21 m)—in a plaza, and was the only finalist to disregard Libeskind's requirement that the buildings overhang the footprints of the Twin Towers. The World Trade Center Memorial Foundation was renamed the National September 11 Memorial & Museum in 2007.A dedication ceremony commemorating the tenth anniversary of the attacks was held at the memorial on September 11, 2011, and it opened to the public the following day. The museum was dedicated on May 15, 2014, with remarks from then mayor of New York City Michael Bloomberg and then President Barack Obama. Six days later, the museum opened to the public.