Ancient city, Harappan architecture, mud brick buildings, intricate drainage systems, advanced urban planning, narrow alleys, stepped wells, granaries, temples, public baths, citadel, fortified walls, bastions, gatehouses, sophisticated sewage systems, baked bricks, sun-dried mud bricks, wooden doors, bronze hinges, narrow windows, flat roofs, courtyard houses, multistoried buildings, Ziggurat-inspired structures, Indus Valley Civilization, 2600 BCE, ancient Indian subcontinent, dry climate, desert landscape, distant mountains.