The term 'Mogul Capital Until 1658' refers to the city of AGRA, which was the capital of the Mughal Empire until 1658. AGRA is a city in India located on the banks of the Yamuna River in the northern state of Uttar Pradesh. It is known for its many Mughal-era monuments, including the iconic Taj Mahal. AGRA was the capital of the Mughal Empire from 1556 to 1658, and it was during this period that many of the city's most famous monuments were built.