The story of power and money is an age-old New York City story. And indeed, it is the story that drove the "arranged marriage" between prominent architects David Childs and Daniel Libeskind. This excerpt from "Sacred Ground" details how two very different architects, were forced to collaborate in designing the Freedom Tower, the signature skyscraper to be built at the World Trade Center site.

The story of the effort to rebuild Lower Manhattan after the terrorist attacks of Sept. 11 and the battle to construct the Freedom Tower at Ground Zero.

The compromise Freedom Tower unveiled in December 2003 was the result of a sometimes contentious collaboration between architects Daniel Libeskind and David Childs. Here is a look at some of the elements each brought to the design.

Paul Goldberger is the architecture critic for The New Yorker and the author of Up from Zero: Politics, Architecture, and the Rebuilding of New York. He recounts how and why politics and design clashed in the building of the Freedom Tower at Ground Zero and describes the end result as "a well-meaning but sad compromise." He tells FRONTLINE: "I think it was a mistake to believe that two good architects, because they're both good architects with intelligent ideas and a commitment to Ground Zero, therefore can produce a single work that will be a coherent and good work. We had what I think is actually an unsuccessful collaboration, because the end result is not as good as either of their buildings were when they had their own separate ideas and visions for them."

A sampling of what architectural critics and others were saying about the compromise Freedom Tower unveiled in December 2003.