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拉斯维加斯Las Vegas is the most populous city in Nevada, United States, the seat of Clark County, and an internationally renowned major resort city for gambling, shopping and fine dining. Las Vegas, which bills itself as The Entertainment Capital of the World, is famous for the number of casino resorts and associated entertainment. A growing retirement and family city, it is the 28th most populous city in the United States with an estimated population by the U.S. Census Bureau of 583,756 as of 2010. The 2010 population estimate of the Las Vegas metropolitan area was 1,951,269.Established in 1905, Las Vegas officially became a city in 1911. With the growth that followed, at the close of the century Las Vegas was the most populous American city founded in the 20th century (a distinction held by Chicago in the 19th century). The citys tolerance for various forms of adult entertainment earned it the title of Sin City, and this image has made Las Vegas a popular setting for films and television programs. There are numerous outdoor lighting displays on Fremont Street, as well as elsewhere in the city.The name Las Vegas is often applied to unincorporated areas that surround the city, especially the resort areas on and near The Las Vegas Strip. The 4.2 mi (6.8 km) stretch of Las Vegas Boulevard known as the Strip is mainly in the unincorporated communities of Paradise and Winchester, and the unincorporated community of Enterprise五角大楼The Pentagon is the headquarters of the United States Department of Defense, located at 48 N. Rotary Road, Arlington, Virginia 22211 (Map). Its mailing address is Washington, DC 20301. As a symbol of the US military, the Pentagon is often used metonymically to refer to the Department of Defense rather than the building itself. Those who work within its walls often simply call it the Building.The building was dedicated on January 15, 1943. It is the highest-capacity office building in the world and one of the worlds largest buildings in terms of floor area. It houses approximately 23,000 military and civilian employees and about 3,000 non-defense support personnel. It has five sides, five floors above ground (plus two basement levels), and five ring corridors per floor with a total of 17.5 miles (28 km) of corridors.At five acres (20,000 m), the central plaza in the Pentagon is the worlds largest no-salute, no-cover area (an area exempt from the normal rule that, when out of doors, U.S. military personnel must wear hats and salute superior officers). The open space in the center is informally known as ground zero, a nickname originating during the Cold War when it was thought of as the most likely target of a nuclear missile. At the center of this plaza is the Ground Zero Cafe, a snack bar.Just south of the Pentagon are Pentagon City and Crystal City, extensive shopping and high-density residential districts in Arlington. Arlington National Cemetery is to the north. The Washington Metro Pentagon station is also located at the Pentagon, on the Blue and Yellow Lines. The Pentagon is surrounded by the complex Pentagon road network, has also been known to locals as The Mixing Bowl.Sixty years to the day after groundbreaking on the Pentagon, the September 11, 2001 attacks occurred. American Airlines Flight 77 crashed into the west side of the Pentagon after being hijacked, killing all aboard as well as over a hundred people within the Pentagon. The flight penetrated three of the five rings of the Pentagon. Because the affected area was under renovation at the time, several offices were unoccupied, sparing many lives. The aircraft struck on the edge between two sectionsone of which had just finished being upgraded.Contractors involved in the Pentagon Renovation Program were also charged with the task of rebuilding the damaged section of the Pentagon following the attacks. This additional project was named the Phoenix Project, with the goal of having the outermost offices in the damaged section occupied again by September 11, 2002. Part of the renovation involved adding improved security features, including walls and windows with greater blast resistance. An initial analysis suggested that the sections improvements had saved lives, enabling more people to evacuate. Repairs included demolition of the damaged areas, complete rebuilding of the area that had previously been renovated, and reconstruction of the shell of the unrenovated section. The first Pentagon tenants whose offices were damaged in the attack began moving back in on August 15, 2002, nearly