Earth Hour:Rome's ancient Colosseum

two-picture combo shows Rome's ancient Colosseum with its lights on, above, and off, to mark an Earth Hour event, Saturday, March 28, 2009. From the Great Pyramids to the Acropolis, the London Eye to the Las Vegas strip, nearly 4,000 cities and towns in 88 countries planned to join in the World Wildlife Fund-sponsored event, a time zone-by-time zone plan to dim nonessential lights between 8:30p.m. and 9:30 p.m
(AP Photo/Gregorio Borgia)