Definitions for national monument
Random House Webster's College Dictionary
a historic site or natural landmark maintained in the public interest by the federal government.
Origin of national monument:
memorial consisting of a structure or natural landmark of historic interest; set aside by national government for preservation and public enjoyment
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"national monument." Definitions.net. STANDS4 LLC, 2013. Web. 24 May 2013. <http://www.definitions.net/definition/national monument>.