Interesting. This doesn't happen very often.
Las Vegas Lights Will Go Dark Saturday Night
Updated: March 27, 2009 10:46 AM PDT
The lights of the world-famous Las Vegas will go dark Saturday in
conjunction with other cities around the world to raise awareness
about conservation.
World Wildlife Fund organized the Earth Hour event and says it is
designed to bring focus to climate change.
The lights at several Las Vegas properties will go dark starting at
8:30 p.m.