Amends the Homeland Security Act of 2002 to include under the definition of "key resources," for purposes of protection by the Directorate for Information Analysis and Infrastructure Protection of the Department of Homeland Security, National Park Service sites identified by the Secretary of the Interior as being so universally recognized as symbols of the United States and so heavily visited by the American and international public that such sites would likely be identified as targets of terrorist attacks, including: (1) the Statue of Liberty National Monument in New York Harbor; (2) Independence Hall and the Liberty Bell in Philadelphia, Pennsylvania; (3) the Gateway Arch in St. Louis, Missouri; (4) Mount Rushmore National Memorial in Keystone, South Dakota; and (5) memorials and monuments in the District of Columbia.