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It is a royal Mausoleum in white marble, placed centrally on a platform 18 ft. high and 315 ft. square, each angle being emphasized by a minaret 133 ft. high. It is symmetrical in plan, being a square of 186 ft. with splayed angles, and has a central dome 80 ft. high of 58 ft. diameter, surmounted by an outer dome nearly 200 ft. above the platform. Around the central dome are two storeyed aisles, each angle having a small dome supported on pillars. The entrance in the center of each face is of the usual recessed type, crowned with a four centered arch set in a square frame. Pierced marble screens in the upper storey admit light, producing a dim and subdued effect.

Reference :
A History of Architecture on the comparative method by SIR Banister Fletcher Page no. 955