As the perfect reflection of Mumtaz Mahal’s paradise-like eternal house, the mausoleum below the domed hall is the core of the complex with its unique decoration, harmony and the echo. The octagonal hall contains eight niches on each of the two storey which are equal in size but differ in their elevation. The details of the ground floor resemble the outside pishtaqs.

All eight niches are ornamented with flower patterns followed by multi-cusped blind arches. The niches are topped by inlaid flowers within the frames of the inscriptions while the niches on the second floor have only the blind arches and rectangular frameworks.

The two floors are bordered with a large line of inscription from the Qur’an. Some of the niches on both floors are covered only with jalis. The floor is patterned geometrically with the border of lobed cartouches in black and white marbles. The naturalistic flower vases are the perfect decoration for the symbolism of the paradise.

- Tomb Chamber - Taj Mahal