Historic Site/Point of Interest and National Symbol/Monument

[Erin @ USGS]

Those of you assigned to edit Historic Site/Point of Interest and
National Symbol/Monument please read this.

We should not designate a Structure as a Historic Site/Point of
Interest or a National Symbol/Monument unless it is already noted as
such with a plaque on the building or a sign stating "point of
interest" or some other authoritative source stating that the feature
falls within these categories. We do not want to be the entity that
determines whether a feature is historic or significant enough to be a
point of interest.

Here is Colorado's link for criteria:
http://www.coloradohistory-oahp.org/programareas/register/1503/sr.htm.

You can conveniently view sites by county on this site.

Here is the National Register of Historic places:
http://www.cr.nps.gov/nr/index.htm

A feature must be listed on one of these websites to be designated as
one of the above feature codes. IMPORTANT: If a feature that is still
on this list is still functioning (i.e. a historic church building
that still functions as a church) do not designate it as a Historic
Site/Point of Interest or a National Symbol/Monument. In that case it
should be designated as its current function (i.e. a House of
Worship) However, PLEASE DO create an additional point labeling it as
a Historic Site/Point of Interest or a National Symbol/Monument if it
is designated as such on a NATIONAL level. In that case there would
be a point labeling the feature as a church and second point labeling
it as a National Symbol.

Below is additional information on the National Register.

The National Register of Historic Places states the following:

The National Register of Historic Places is the nation's official list
of buildings, structures, objects, sites, and districts worthy of
preservation because of their significance in American history,
architecture, archeology, engineering, and culture. The National
Register recognizes resources of local, state and national
significance which have been documented and evaluated according to
uniform standards and criteria.
Authorized under the National Historic Preservation Act of 1966, the
National Register is part of a national program to coordinate and
support public and private efforts to identify, evaluate, and protect
historic and archeological resources. The National Register is
administered by the National Park Service, which is part of the U. S.
Department of the Interior.
Criteria for National Register Designation
To be eligible for listing in the National Register, a resource must
meet at least one of the following criteria:
• Is associated with events that have made a significant contribution
to the broad patterns of our history (Criterion A).
• Is associated with the lives of persons significant in our past
(Criterion B).
• Embodies the distinctive characteristics of a type, period or method
of construction, or represents the work of a master, or possesses high
artistic values, or represents a significant and distinguishable
entity whose components may lack individual distinction (Criterion C).
Has yielded, or may be likely to yield, information important in
history or prehistory (Criterion D).
Under The Antiquities Act of 1906, national monuments are objects of
historic or scientific interest, and this act allowed President
Roosevelt (Teddy) to designate not only small areas but large
geographic areas as national monuments. The original intent was to
protect the Anazazi ruins of the southwest but Roosevelt used it to
protect huge tracts of land (e.g. what is now the Grand Canyon
national park).

[Andi]

If a building is both on the Historical Registry and functions as a Museum, how is it supposed to be labeled? 

[Erin @ USGS]

Since that building functions as a museum that is its primary
function. Therefore label it as a museum.