Just
opposite to the mosque in Taj Mahal i.e., on the eastern side of the Taj
is a monument that is known to be a twin of the mosque. This red
sandstone monument is called Taj Mahal Naqqar Khana or the Rest house or
Jawab (Answer) and is faced away from the Mecca. It is built exactly
like the mosque of Taj Mahal. However, it was never used for prayer
purposes. Infact, till today the purpose of building the rest house in
Taj Mahal, of Agra, is not known. However, some people believe that it was constructed to conserve the symmetry of Taj Mahal. Beautiful flower designs and other decoration, in white marble, adorn the Taj Mahal Naqqar Khana. The floor between this monument and the mosque also reflects a full size reproduction of the pinnacle embellishing the Taj Mahal.