Italian tourists walk in the Mesquite Dunes during heat wave in Death Valley National Park, California
Sara Calcinaro (L) and Marco Rizzelli of Italy walk in the Mesquite Dunes as high temperatures approach record levels in Death Valley National Park, California June 29, 2013. Extreme heat enveloped most of California and Nevada and parts of southern Arizona as a large high-pressure system trapped hot air across the area, National Weather Service meteorologist Todd Lericos said. REUTERS/Steve Marcus (UNITED STATES - Tags: ENVIRONMENT TRAVEL)
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