Serra da Estrela Natural Park (IMAGE) Pensoft Publishers Caption This image shows one of the cool humid tunnel of the drainage galleries in Serra da Estrela Natural Park. Credit Gonçalo M. Rosa Usage Restrictions CC-BY 3.0 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.