Delhi and Agra, among the most densely populated cities in the world, have been the seats of power and empires, along with Fatehpur Sikri, for more than a millennium. The three cities are also home to six majestic UNESCO World Heritage Sites, namely the Qutb Minar, Agra Fort, Humayun's Tomb, Fatehpur Sikri, Taj Mahal, and …
