世界著名的建筑~~~~~~~~~~~~~~~~~~~ of cities in the United States美國的城市（這里有好多，你點擊城市的名字，可以看具體的介紹）~~~~~~~~~~~~~~~~~~~~~~~~~~~ of famous American houses美國著名的房子（建筑）~~~~~~~~~~~~New York City York City, officially the City of New York, is the most populous city in the United States and the most densely populated major city in North America.The city is at the center of international finance, politics, entertainment, and culture, and is one of the world's major global cities with a virtually unrivaled collection of museums, galleries, performance venues, media outlets, international corporations, and financial markets. It is also home to the global headquarters of the United Nations.Located in the state of New York, New York City has a population of 8.1 million[1] within an area of 321 square miles (approximately 830 km2).[2] It is at the heart of the New York Metropolitan Area, which at a population of 22 million is among the largest urban areas in the world.[3] The city proper consists of five boroughs: The Bronx, Brooklyn, Manhattan, Queens, and Staten Island. Each of these boroughs, except for Staten Island, is home to at least a million people and would each be among the nation's largest cities if considered independently.Nicknamed "the Big Apple", the city attracts large numbers of immigrants from over 180 countries, as well as people from all over the United States, who come for its culture, energy, cosmopolitanism, and economic opportunity. The city is also currently notable for having the lowest crime rate among major American cities..................Washington, D.C.http://en.wikipedia.org/wiki/Washington_DCWashington, D.C. is the capital city of the United States of America. "D.C." stands for the "District of Columbia", the federal district containing the city of Washington. The city is named after George Washington, military leader of the American Revolution and the first President of the United States. The District of Columbia and the city of Washington are coextensive and are governed by a single municipal government, so for most practical purposes they are considered to be the same entity (this was not always the case, though, as Georgetown was a separate city within the District until 1871). However, although there is a municipal government and a mayor, as per Article I, Section VIII, of the United States Constitution, Congress has the sole authority over this federal district. It is commonly known as the District, D.C., or simply Washington. Historically, it was called the Federal City or Washington City.The District of Columbia, founded on July 16, 1790, is a federal district as specified by the United States Constitution. The U.S. Congress has ultimate authority over the District of Columbia, though it has delegated limited local rule to the municipal government. The land forming the original District came from the states of Virginia and Maryland. However, the area south of the Potomac River (39 mi2 or about 100 km2) was returned, or "retroceded", to Virginia in 1847 and now is incorporated into Arlington County and the City of Alexandria. The term "District of Columbia" is derived from an old poetic name for the United States, Columbia, which has fallen out of common use since the early 20th century.The centers of all three branches of the U.S. federal government are in Washington, D.C., as well as the headquarters of most federal agencies. Washington also serves as the headquarters for the World Bank, the International Monetary Fund, and the Organization of American States, among other international (and national) institutions. All of this has made Washington the frequent focal point of massive political demonstrations and protests, particularly on the National Mall. Washington is also the site of numerous national landmarks, museums, and sports teams, and is a popular destination for tourists.The population of the District of Columbia, as of 2003 U.S. Census Bureau estimates, is 563,384. The Greater Washington, D.C. metropolitan area includes the District of Columbia and parts of Maryland, Virginia, and West Virginia, with a population surpassing 4.7 million. If Washington, D.C., were considered a state, it would rank last in area behind Rhode Island, 50th in population ahead of Wyoming, and 36th in Gross State Product, ahead of 15 states, and its GSP per capita would be #1 by far compared to other states.............................Los Angeles, California City of Los Angeles, also known simply as L.A. or informally as the City of Angels, is the second-largest city in the United States in terms of population. It was incorporated as a city in California on April 4, 1850 and is the county seat and the largest city in Los Angeles County. As of the 2000 U.S. Census, the city had a population of 3.69 million, though a July 1, 2004 estimate placed the city's population at 3.85 million, out of 10 million residents in the county. Los Angeles serves as the core and most important city of the sprawling Southern California urban area which counts nearly 18 million residents. The city is also large by geographic standards since it sprawls over more than 465 square miles (1,200 square kilometers), making it larger than either New York City or Chicago in area.Los Angeles is one of the cultural, economic, scientific and entertainment centers of the country. The city is also one of the most cosmopolitan places in the world, as well as a vanguard of creativity, since it is home to individuals from virtually every nation on Earth. People have always been attracted to the city for its balmy weather, vibrant lifestyle, unique, high-velocity energy, Pacific Rim gateway status, and the opportunity to realize the "American Dream." In addition, Los Angeles hosted two Olympic Games (in 1932 and 1984) and is home to world-renowned scientific and cultural institutions...........