From the World Heritage inscription:
The Declaration of Independence was adopted in 1776 in this fine 18th century building in Philadelphia, to be followed in 1787 by the framing of the Constitution of the United States of America. Although conceived in a national framework and hence of fundamental importance to American history, the universal principles of freedom and democracy set forth in these documents were to have a profound impact on lawmakers and political thinkers around the world. They became the models for similar charters of other nations, and may justly be considered to have heralded the modern era of government.
Independence Hall is one of the few cultural World Heritage sites in North America which is not related to native americans. Visiting the site is very easy as it is in the city center of Philadelphia. Within walking distance you can also see a number of other historical attractions including the Liberty Bell, Ben Franklin’s home and the Tomb of the Unknown Soldier from the Revolutionary War.
View my complete list of UNESCO World Heritage Sites