Edifices erected as commemorative burial places, often but not exclusively limited to large, stately, or imposing edifices for or by a person of distinction. The word is derived from the burial place of Mausolus, ruler of Caria, in whose memory his widow Artemisia raised a splendid tomb at
Halicarnassus (ca. 350 BCE).

Source: AAT

http://vocab.getty.edu/page/aat/300005891