With a 30-by-30-foot base and a height of 70 feet, the monument contained three rooms, one above the other, the first of which was located within the podium—or bottom layer. The second room was vaulted and crowned with an intricate entablature (horizontal superstructure above columns), including a Doric frieze (wide, central section of an entablature) and cornice (decorative, often projecting, horizontal ledge or molding). It likely featured outer walls with pilasters (rectangular column-like protrusions).

While the bottom two rooms were square, the top room was circular and surrounded by a portico of columns. This upper room also possessed an architrave (lintel or beam above column capitals), a soffit frieze, a decorated cornice and a domed roof with urns.