Mausoleum is a building constructed as a monument enclosing the interment space or burial chamber of a deceased person. Its plural form is mausolea, although in America we commonly use for plural - mausoleums. What is the origin of the word? It was derived from the name of King Mausollos, ruler of ancient kingdom of Caria. His tomb - Mausoleum - was such an architectural marvel that it was considered to be the greatest aesthetic triumph. Ancients thought of it as the highest achievement and called it one of the Seven Wonders of the Word.