Answer:
nhl is short form if national historical landmark
Step-by-step explanation:
A National Historic Landmark (NHL) is a building, district, object, site, or structure that is officially recognized by the United States government for its outstanding historical significance. Only some 2,500 (~3%) of over 90,000 places listed on the country's National Register of Historic Places are recognized as National Historic Landmarks.
Independence National Historical Park is one of the most widely visited National Historic Landmark Districts.
Navajo Nation Council Chamber, the seat of government for the Navajo Nation, Window Rock, Arizona
A National Historic Landmark District may include contributing properties that are buildings, structures, sites or objects, and it may include non-contributing properties. Contributing properties may or may not also be separately listed.