Restoring Hetch Hetchy, Yosemite's twin.

San Francisco will be voting whether to drain the reservoir, revealing whatever's been under 90 meters of water for a century.

In his 1912 book The Yosemite, [John] Muir wrote: "Dam Hetch Hetchy! As well dam for water-tanks the people's cathedrals and churches, for no holier temple has ever been consecrated by the heart of man."

CORRECTION: Originally, I'd written 90 feet. It's 90 meters.