Independence Hall – Philadelphia, Pa. is a UNESCO World Heritage Site and is also on the National Register of Historic Places.
The following information is quoted from Philadelphia.about.com
Chestnut Street between 5th and 6th Streets
Built between 1732 and 1756 as the State House of the Province of Pennsylvania, Independence Hall is considered a fine example of Georgian architecture. From 1775 to 1783 this was the meeting place for the Second Continental Congress.
It was here that George Washington was appointed commander in chief of the Continental Army in 1775 and the Declaration of Independence was adopted on July 4, 1776. In the Assembly Room the design of the American flag was agreed upon in 1777, the Articles of Confederation were adopted in 1781, and the U. S. Constitution was drafted in 1787.
The building has undergone extensive restoration work in recent years. In order to visit Independence Hall, tickets for a tour must be obtained from the ticket booth located directly across from the building on Chestnut Street