Mohenjodaro and Harappa, now in modern-day Pakistan as well western states of the Republic of India. The earliest settlements are seen during the Neolithic period in Merhgarh, Balochistan. The civilization's cities were noted for their urban planning with baked brick buildings, elaborate drainage and water systems, and handicraft (carnelian products, seal carving). This civilisation transitioned from the Neolithic period into the Chalcolithic period and beyond with their expertise in metallurgy (copper, bronze, lead, and tin). Their urban centres possibly grew to contain between 30,000 and 60,000 individuals, and the civilisation itself may have contained between one and five million individuals. Greek Without a doubt, ancient Greek architecture, together with Roman, is one of the most influential styles of all time. Since the advent of the Classical Age in Athens, in the 5th century BC, the Classical way of building has been deeply woven into Western understanding of architecture and, indeed, of civilization itself. From circa 850 BC to circa 300 AD, ancient Greek culture flourished on the Greek mainland, on the Peloponnese, and on the Aegean islands. Five of the Wonders of the World were Greek: the Temple of Artemis at Ephesus, the Statue of Zeus at Olympia, the Mausoleum at Halicarnassus, the Colossus of Rhodes, and the Lighthouse of Alexandria. However, Ancient Greek architecture is best known for its temples, many of which are found throughout the region, and the Parthenon is a prime example of this. Later, they will serve as inspiration for Neoclassical architects during the late 18th and the 19th century. The most well-known temples are the Parthenon and the Erechtheion, both on the Acropolis of Athens. Another type of important Ancient Greek buildings were the theatres. Both temples and theatres used a complex mix of optical illusions and balanced ratios. Ancient Greek temples usually consist of a base with continuous stairs of a few steps at each edges (known as crepidoma), a cella (or naos) with a cult statue in it, columns, an entablature, and two pediments, one on the front side and another in the back. By the 4th century BC, Greek architects and stonemasons had developed a system of rules for all buildings known as the orders: the Doric, the Ionic, and the Corinthian. They are most easily recognised by their columns (especially by the capitals). The Doric column is stout and basic, the Ionic one is slimmer and has four scrolls (called