National Monuments and Icons Sector-Specific Plan: An Annex to the National Infrastructure Protection Plan  [open pdf - 1MB]
"The National Monuments and Icons (NMI) Sector-Specific Plan (SSP) was created to complement the National Infrastructure Protection Plan (NIPP) in improving protection of the NMI Sector in an all-hazard environment. The NMI SSP promotes a col¬laborative partnership at all levels of government to foster the cooperation necessary to improve the protection of NMI critical infrastructure and key resources (CIKR). The NMI SSP is a pathway to identify and prioritize assets, assess risk, implement pro¬tective programs, and measure the effectiveness of protective programs. This document represents the collaborative efforts of our sector partners, all dedicated to the protection and resilience of CIKR assets as it relates to all hazards within the NMI Sector."
United States. Dept. of Homeland Security: http://www.dhs.gov/