The Skyscraper Museum: WTC Monument
- Online-presentation of an exhibition that took place in spring 2002, dedicated to the construction and history of the twin towers. Includes historical photography and models of the buildings.
- http://www.skyscraper.org/EXHIBITIONS/WTC_MONUMENT/wtcmonument.htm

Sonic Memorial Project
- Archive and online audio installation of the history of the World Trade Center. Includes sounds, stories, timeline, and resources for educators. With information how to contribute personal stories or audio memories.
- http://sonicmemorial.org/

New York's World Trade Center: A Living Archive
- Documentation on the building and its history provided by Eric Darton. Includes stories, comments and quotes, literary allusions. With bibliography and links to related sites.
- http://ericdarton.net/

Skyscraper.org: World Trade Center
- Image and description of the seven-building office complex in New York.
- http://www.skyscraper.org/tallest/t_wtc.htm

World Trade Center History
- An illustrated outline of the rise and use of the twin towers that became symbols of New York, by David Johnson from Infoplease.
- http://www.infoplease.com/spot/wtc1.html

Structurae: One World Trade Center
- Technical and historical data, photographs, links, and literature on the North Tower.
- http://www.structurae.de/en/structures/data/str00088.html

Great Buildings Online: World Trade Center
- Information about the building, the architect, images, drawings, 3D model, commentary and resources.
- http://www.greatbuildings.com/buildings/World_Trade_Center.html

About.com: World Trade Center Architecture Issues
- Details about the construction and destruction of the towers.
- http://architecture.about.com/library/weekly/aa091201a.htm?PM=n31091301a

The Height of Ambition
- The history of the planning and construction of the building, with a timeline, interactive graphic and multimedia. New York Times [free registration required].
- http://www10.nytimes.com/2002/09/08/magazine/08WTC1.html