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HANGZHOU, China -- In one of this nation's most popular tourist cities, famed for the beauty of its surrounding mountains, willow trees, lotus blossoms and ancient stone-arch bridges, a new sightseeing attraction is making its debut: the local landfill. With its so-called "trash tour," the landfill has attracted more than 10,000 visitors since it launched last year. There, tourists visit its trash-to-gas power plant, play environmental video games and hike in an eco-park the size of 10 football fields

This month marks the 100th anniversary of the completion of the Roosevelt Dam in Arizona. It was a major part of the Salt River project, which aimed to create hydroelectric power from the Salt River and make its surrounding lands cultivable. The dam was an engineering marvel and was built as part of the Reclamation Act passed in 1902, which sought to irrigate arid lands in the United States--about one-third of the country’s land at the time