The civilization known for the development of advanced urban planning is the Indus Valley Civilization, which thrived around 2500 BC in what is now Pakistan and northwest India. This ancient culture is celebrated for its well-planned cities, such as Mohenjo-Daro and Harappa, characterized by grid layouts, advanced drainage systems, and standardized fired-brick constructions. Streets were remarkably straight and organized, facilitating trade and movement. The Indus Valley's urban planning reflects a sophisticated understanding of engineering and public health, which was remarkable for its time and set a precedent for subsequent civilizations in urban development and infrastructure.