Delhi is a city rich in history, serving as the capital for various empires and undergoing numerous reconstructions following invasions. Key historical sites include India Gate, a war memorial for soldiers, Red Fort, the main residence of the Mughal dynasty, Qutub Minar, a UNESCO World Heritage site, and Humayun's Tomb, which set a precedent for Mughal architecture. Each landmark highlights unique architectural styles and the historical significance of the region across centuries.