From Longman Dictionary of Contemporary Englishnational monumentˌnational ˈmonument noun [countable] DLTPGa building, special feature of the land etc that is kept and protected by a government for people to visit
Examples from the Corpus
national monument• It has lofty and spacious reception rooms and a ballroom and has been declared a national monument.• The de Courmont house is a national monument.• The fort, the ninth on this site, is now a national monument.• The fossils were found in Dinosaur National Monument in Utah.• Not her national monument I told her, and she shouldn't come poking her nose in where it wasn't wanted.• The national monument is called the Great Stupa, which sums up the mood. 