Julia Butterfly Hill and Her Tree sit in Luna 1 Favorite 

Forest activist and environmentalist Julia Butterfly Hill spent two years (Dec. 10, 1997-Dec. 18, 1999) living 180 feet high, on two six-by-six-foot platforms, in the canopy of a thousand-year-old redwood tree named Luna to help make the world aware of the plight of the redwood forest.

Julia, with the great help of steelworkers and environmentalists, successfully negotiated to permanently protect the 1,000 year-old tree and a nearly three-acre buffer zone.