National Register of Historic Places was created in 1966.
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The National Park Service as a part of the US Department of
Interior operates the National Register of Historic Places which
now includes over 80,000 listings.
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Organ Cave is in Greenbrier County,
West Virginia. It is a large and historic cave that is listed on
the National Register of Historic Places.
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Kulpmont, Pennsylvania is in Northumberland County.
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Yes. The New London County Courthouse is an historic courthouse
at 70 Hunting Street in New London, Connecticut. It was built in
1784 and added to the National Register of Historic Places in
1970.