The Taj Mahal (also "the Taj"), located in Agra, is considered the finest example of Mughal architecture, a style that combines elements from Persian, Turkish, Indian, and Islamic architectural styles. The focus of the Taj Mahal is the white marble tomb, which stands on a square plinth consisting of a symmetrical building with an iwan, an arch-shaped doorway, topped by a large dome. It was built by the Mughal emperor Shah Jahan (1628-1658), grandson of Akbar the great, in the memory of his queen Arjumand Bano Begum, entitled 'Mumtaz Mahal'. The plinth and tomb took roughly 12 years to complete. The remaining parts of the complex took an additional 10 years and were completed in order of minarets, mosque and jawab and gateway. A labour force of 20,000 workers was recruited across northern India.