Nature's Filters (IMAGE) University of Pittsburgh Caption The Center for Sustainable Landscapes exterior with constructed wetlands and lagoon at Phipps Conservatory and Botanical Gardens. Credit Denmarsh Photography Inc. Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.