The Delos Initiative focuses on the sacred natural sites in developed countries throughout the world. Its main purpose is to help in maintaining both the sanctity and the biodiversity of these sites, through the understanding of the complex relationship between spiritual/cultural and natural values. This publication includes all presentations made at the Second Workshop of The Delos Initiative, which took place in Ouranoupolis in 2007. All speeches delivered and case studies presented at the workshop have been included, as well as conclusions and lessons learned.