The restoration of Congress Hall in Philadelphia , where the U.S. Congress met from 1790 to 1800 before Washington , D.C. became the American capital , was completed .
The building returned to restoration 's 1776 appearance .
The restoration of Congress Hall in Philadelphia , where the U.S. Congress met from 1790 to 1800 before Washington , D.C. became the American capital , was completed , and the building returned to its 1776 appearance .