To authorize the Secretary of the Interior to make improvements to support facilities for National Historic Sites operated by the National Park Service, and for other purposes.

[AI summary unavailable — showing source text] Authorizes the Secretary of the Interior, through the National Park Service (NPS), to make improvements to a support facility, including a visitor center, for a National Historic Site administered by the NPS if such project: (1) is conducted within the agency's existing budget, (2) is subject to a 50% non-federal cost sharing requirement, and (3) is conducted for a unit of the NPS which has the authority to establish a support facility outside the park's boundary. Allows the NPS to operate and use all or part of a support facility, including a visitor center, for such a Site: (1) to carry out the duties associated with the administration and support of such Site, and (2) only in situations where there is an agreement between the Secretary and the commissioners of the county or parish in which the facility is located.…