More stories about Preservation

  • The challenge of a lifetime

    In the shadow of one of last century's greatest civil projects, designers and engineers forged a bypass out of river and rock in one of the nation's most unforgiving environments. Here's how they did it.

  • What lies beneath

    Arizona wastewater utility makes historical discovery.

  • Counties Collect Conservation Honors

  • Big Cities Greener than Ever

    In 2005, the 60 largest U.S. cities spent a record $4.3 billion in maintaining and growing their parks systems. However, green-space advocates maintain more funding is needed to improve urban quality of life.