 Outside the walls are several additional mausoleums, including those of Shah Jahan's other wives, and a larger tomb for Mumtaz's favourite servant.The main gateway ("darwaza") is a monumental structure built primarily of marble, and reminiscent of the Mughal architecture of earlier emperors.Its archways mirror the shape of the tomb's archways, and its "pishtaq" arches incorporate the calligraphy that decorates the tomb.