In the Eastern Orthodox tradition, this is Holy Week, culminating in Easter Sunday.

Mt. Athos, in Greece, has been home to Greek Orthodox monks for thousands of years. 

Denis Hayes, chairman of Earth Day 1990, believes that it's time for people to integrate environmental values throughout their whole lives. An archival program.

The founder of Earth Day outlines participatory events around the world. An archival program

In celebration of the enduring spirit of one of the world's great places of worship.