Sialk Zigguart the bigest and oldest (3000BC) Iran
3D Sialk Zigguart (3000BC) Iran

Choghar zanbil (1800 BC) Iran


3D of zigguart of UR (2100 BC) Iraq



Ziggvuart of UR (2100 BC)



Befor pyramids it was ziggurat.

A ziggurat (Babylonian ziqqurrat, D-Stem of zaqāru "to build on a raised area") is a temple tower of the ancient Mesopotamian valley and Iran, having the form of a terraced pyramid of successively receding stories.
Contents


Description
Ziggurats were a form of temple tower common to the Sumerians, Babylonians and Assyrians of ancient Mesopotamia. The earliest examples of the ziggurat were simple raised platforms that date from the Ubaid period during the fourth millennium BC and the latest date from the 6th century BCE. The top of the ziggurat was flat, unlike many pyramids. The step pyramid style began near the end of the Early Dynastic Period. Built in receding tiers upon a rectangular, oval, or square platform, the ziggurat was a pyramidal structure. Sun-baked bricks made up the core of the ziggurat with facings of fired bricks on the outside. The facings were often glazed in different colors and may have had astrological significance. The number of tiers ranged from two to seven, with a shrine or temple at the summit. Access to the shrine was provided by a series of ramps on one side of the ziggurat or by a spiral ramp from base to summit. Notable examples of this structure include the Great Ziggurat of Ur and Khorsabad in Mesopotamia.
The Mesopotamian ziggurats were not places for public worship or ceremonies. They were believed to be dwelling places for the gods. Through the ziggurat the gods could be close to mankind and each city had its own patron god. Only priests were permitted on the ziggurat or in the rooms at its base and it was their responsibility to care for the gods and attend to their needs. As a result the priests were very powerful members of Sumerian society.

The University of Tennessee Hodges Library.
There are 32 ziggurats known at, and near Mesopotamia. Four of them are in Iran, and the rest are mostly in Iraq. The most recent to be discovered was Sialk, in central Iran.
One of the best preserved ziggurats is Choqa Zanbil in western Iran, which has survived despite the devastating eight year Iran-Iraq war of the 1980's in which many archeological sites were destroyed. The Sialk, in Kashan, Iran, is the oldest known zigurrat, dating to the early 3rd millennium BCE. Ziggurat designs ranged from simple bases upon which a temple sat, to marvels of mathematics and construction which spanned several terraced stories and were topped with a temple.
An example of a simple ziggurat is the White Temple of Uruk, in ancient Sumer. The ziggurat itself is the base on which the White Temple is set. Its purpose is to get the temple closer to the heavens, and provide access from the ground to it via steps.
An example of an extensive and massive ziggurat is the Marduk ziggurat, or Etemenanki, of ancient Babylon. Unfortunately, not much of even the base is left of this massive structure, yet archeological findings and historical accounts put this tower at seven multicolored tiers, topped with a temple of exquisite proportions. The temple is thought to have been painted and maintained an indigo color, matching the tops of the tiers. It is known that there were three staircases leading to the temple, two of which (side flanked) were thought to have only ascended half the ziggurat's height.

CAD rendering of Sialk's largest ziggurat based on archeological evidence.
Etemenanki, the name for the structure, is Sumerian and means "The Foundation of Heaven and Earth." Most likely being built by Hammurabi, the ziggurat's core was found to have contained the remains of earlier ziggurats and structures. The final stage consisted of a 15-metre hardened brick encasement constructed by King Nebuchadnezzar.
The ziggurat style of architecture continues to be used and copied today in many places of the world. Some examples would be:
The University of Tennessee Hodges Library in Knoxville, Tennessee.
Ziggurat by the river, near downtown Sacramento, California, used for California state agency office space.
Halls of residence for students at the University of East Anglia, in Norwich, United Kingdom.
The SIS Building, also commonly known as the MI6 Building, which is the headquarters of the British Secret Intelligence Service.

Interpretation and significance
According to Herodotus, at the top of each ziggurat was a shrine, although none of these shrines have survived. One practical function of the ziggurats was a high place on which the priests could escape rising water that annually inundated lowlands and occasionally flooded for hundreds of miles, as for example the 1985 flood. Another practical function of the ziggurat was for security. Since the shrine was accessible only by way of three stairways, a small number of guards could prevent non-priests from spying on the rituals at the shrine on top of the ziggurat. These rituals probably included cooking of sacrificial food and burning of carcasses of sacrificial animals. The height of the ziggurat allowed the smoke to blow away without polluting city buildings. Each ziggurat was part of a temple complex that included a courtyard, storage rooms, and living quarters, around which a city was built.
The Biblical account of the Tower of Babel may be based on Mesopotamian ziggurats, or Etemenanki in particular.