To amend the National Historic Preservation Act to prohibit the inclusion of certain sites on the National Register of Historic Places, and for other purposes.

Amends the National Historic Preservation Act to prohibit unimproved or unmodified natural landscape features that do not contain artifacts or other physical evidence of human activity that have unique significance in history or pre-history from being: (1) eligible for inclusion on the National Register of Historic Places; (2) included on the Register; or (3) considered to be a historic or pre-historic property or historic resource for purposes of the Act or other Federal laws. Provides that nothing in this Act shall invalidate or otherwise affect determinations made before this Act's enactment with respect to any site.

Prohibits the Mt. Shasta area in California from being designated by any U.S. agency or authority as a historic district, historic site, or national monument under the Act or the Antiquities Act. Ceases the force and effect of any inconsistent designation made before enactment of this Act.