structure,
construction a thing constructed; a complex entity constructed of many parts; "the structure consisted of a series of arches"; "she wore her hair in an amazing construction of whirls and ribbons"
megalith,
megalithic structure memorial consisting of a very large stone forming part of a prehistoric structure (especially in western Europe)
national monument memorial consisting of a structure or natural landmark of historic interest; set aside by national government for preservation and public enjoyment
monument -
A surveying reference point marked by a permanently fixed marker a survey monument.
Wikipedia
A monument is a type of structure either explicitly created to commemorate a person or important event or which has become important to a social group as a part of their remembrance of past events. They are frequently used to improve the appearance of a city or location. Cities that are planned such as Washington D.C.
OmegaWiki Dictionary
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monument An object, especially large and made of stone, built to remember and show respect to a person or group of people, or a special place made for this purpose.
monument A burial vault (usually for some famous person).