Water

Willis Tower Looking Up

Willis Tower: Chicago, IL

Designed just prior to the energy crisis in the 1970s, the tallest building in the western hemisphere still uses many of its original major building systems. Improvements ...

Epa Ext Horz Overall Front Face 12 Hr

EPA Region 8 Headquarters: Denver, CO

This building harnesses the natural resources of Denver's climate. The nine-story atrium provides daylight to the lobby and internal offices, while parabolic sails ...