美国国家档案馆

　　As well as a copy of the Magna Carta， dating from 1297， the National Archives hold exhibitions and serve as the official repository of all US national records  census data， treaties （including the surrender of Japan in World War II）， passport applications， as well as genealogical records  most of which are kept in storage. On display inside the impressive Neoclassical Greek temple  designed by the National Gallery's John Russell Pope  are the three short texts upon which the United States is founded： the Declaration of Independence， the Constitution and the Bill of Rights. These three original sheets of parchment （the three further pages of the Constitution are not on display）， drafted respectively in 1776， 1787 and 1789， are now contained in helium-filled glass cases， which drop underground in case of fire or other threat. You can usually look at them as long as you like， but if there's a crowd you have to shuffle on past.