Feb. 27, 2003 - Daniel Libeskind's "Memory Foundations" is selected as the new design for the World Trade Center site.
Sept. 17, 2003 - The LMDC releases a revised Master Plan for the World Trade Center Site.
Nov. 23, 2003 - The N.J. commuter train, the PATH Station, returns to a temporary site near the WTC area.
Dec. 19, 2003 - Plans for the Freedom Tower, to be built at ground zero, are revealed.
Jan. 22, 2004 - Architect Santiago Calatrava unveils his plans for the WTC transportation hub.
July 4, 2004 - Construction at the Freedom Tower begins. A 20-ton slab of granite, inscribed "the enduring spirit of freedom" is laid as the cornerstone of one of the new skyscrapers that will stand on the site.
May 4, 2005 - Gov. George Pataki calls for a redesign in the plans for the new tower for safety reasons.
June 29, 2005 - New York officials release the latest design for the signature building at the World Trade Center site after revising it to make the tower more secure.
Sept. 6, 2005 - Architect Santiago Calatrava and public officials dedicate the first steel rail for the future transportation station to be built at the World Trade Center site.
Dec. 15, 2005 - Architect Lord Norman Foster agrees to design the next major building planned for the World Trade Center site. Foster will design a 65-story tower for the northeast corner of the 16-acre site that real estate developer Larry Silverstein said will be completed by 2011.
April 26, 2006 - The Port Authority of New York and New Jersey and developer Larry Silverstein reach an agreement about the financing of Freedom Tower, resolving problems that had delayed construction at the WTC site.
April 27, 2006 - The formal groundbreaking of Freedom Tower takes place.
May 17, 2006 - Gov. Pataki appoints Kevin M. Rampe chairman of the Lower Manhattan Development Corporation, to replace John Whitehead.
March 26, 2009 - The Port Authority of New York and New Jersey announces dropping the name "Freedom Tower," and that the first commercial lease in the building has been signed. Upon completion, the building will be named One World Trade Center.
July 2009 - Muslim investors purchase the property at 49-51 Park Place, two blocks north of the former World Trade Center.
May 7, 2010 - Community Board of lower Manhattan votes unanimously in favor of the Cordoba House Project, which includes plans for a 15-story community center, mosque, performing arts center, gym, swimming pool and other public areas.
July 2010 - The Cordoba House Project is renamed Park51.
Summer 2010 - Protesters demonstrate against construction of the Islamic community center and mosque near ground zero.
Aug. 3, 2010 - Plans for the Islamic center continue as New York City's Landmarks Preservation Commission denies landmark status to 45-47 Park Place, a nearby building.
Aug. 3, 2010 - New York Mayor Michael Bloomberg speaks in favor of the center, saying that blocking the center would be an affront to religious freedom.
Aug. 13, 2010 - President Barack Obama expresses his support for Park51, citing freedom of religion.
Sept. 21, 2011 - The Park51 Islamic community center opens with the debut of NYChildren, a photography exhibit showcasing the portraits of New York City children originating from over 160 countries.
May 10, 2013 - Construction workers bolt the last pieces of a 408-foot spire into place atop One World Trade Center, bringing the building to a height of 1,776 feet. This height references the year the United States declared its independence. It also makes the building the tallest in the Western Hemisphere and the third-tallest in the world.