Pakistani architecture can be divided into four periods: Pre-Islamic, Islamic, Colonial, and Post-Colonial. Mohenjo-Daro and Harappa are two important archeological sites from the Indus Valley Civilization that flourished around 3000 BCE. Kot Diji was an early settlement that predated the Indus Civilization. Across Pakistan, brightly painted trucks function as a mobile art gallery, with colorful landscapes and images decorating their exteriors.