The greatest city the ancient world ever built — where Marduk was worshipped from the most magnificent temple complex in Mesopotamia, where the Jews spent their exile, where astronomy was perfected, and where Alexander the Great came to die.
At its height under Nebuchadnezzar II (605–562 BCE), Babylon was probably the largest city on Earth — a metropolis of perhaps 200,000 inhabitants within walls so massive that the Greek historian Herodotus described them as broad enough to turn a four-horse chariot on top. The city occupied both banks of the Euphrates, connected by a permanent bridge. Its streets were laid out in a grid — one of the earliest examples of urban planning at this scale. Its walls were pierced by eight great gates, each named for a god, the most magnificent of which was the Ishtar Gate.
The city had risen to prominence under Hammurabi in the 18th century BCE — who united Mesopotamia under Babylonian rule and gave the world its first comprehensive law code. But Babylon's greatest glory came fifteen centuries later under the Neo-Babylonian Empire, when Nebuchadnezzar II rebuilt the city on a scale that left every contemporary observer speechless. The temples, palaces, processional ways and gardens he built made Babylon the wonder of the ancient world — and placed two of its monuments on the classical list of the Seven Wonders.
The city sat at the centre of a vast agricultural system fed by canals drawn from the Euphrates — the same irrigation infrastructure that had supported Mesopotamian civilisation for two millennia. The Euphrates itself ran through the city, and Babylon controlled the river trade of the entire region. To enter Babylon was to enter the wealthiest, most cosmopolitan and most religiously charged city in the ancient Near East — a city where dozens of temples served dozens of gods, where the priests of Marduk held astronomical records going back centuries, and where the intellectual and commercial life of the ancient world converged.
The sacred heart of Babylon was the Esagila — "the house whose head is high" — the great temple complex of Marduk that occupied a substantial portion of the city's southern district. Esagila was not merely a temple but a city within the city: a walled precinct containing the main shrine of Marduk, subsidiary temples for associated deities, storehouses, administrative buildings, astronomical observation platforms and the residences of the priestly class who maintained the cult.
Within the Esagila, the statue of Marduk sat in its golden shrine — dressed, fed, bathed and entertained daily by the priests in a ritual that maintained the cosmic order. The Babylonians understood this service not as mere symbolism but as practical necessity: the gods required maintenance, and if the maintenance ceased, the cosmos would become disordered. The priests who served Marduk were not merely religious functionaries but the operators of the machinery of the universe.
Adjacent to the Esagila rose Etemenanki — "the house that is the foundation of heaven and earth" — the great ziggurat of Babylon, which many scholars identify as the historical basis for the Biblical Tower of Babel. At its height it stood approximately 91 metres — roughly the height of a modern 30-storey building — and was visible from across the flat Mesopotamian plain for dozens of miles. At its summit was a small blue-glazed shrine, the bedchamber of Marduk, approached by a triple staircase on its southern face. Herodotus, who may have visited Babylon around 450 BCE, described it as still standing in his time, with a golden couch at the summit where a specially chosen woman waited for the god each night.
"In the last tower there is a spacious temple, and inside the temple stands a great bed well furnished, with a golden table by its side. There is no statue of any god here; nor does any human creature lie there for the night except one native woman, who is chosen from all women by the god, as the Chaldeans say."
— Herodotus, Histories, c. 440 BCETwo of the Seven Wonders of the Ancient World were associated with Babylon — the Hanging Gardens and the city walls themselves (in some ancient lists). The Ishtar Gate, though not on the classical Wonder lists, is the most spectacular surviving monument of Babylonian civilisation: its reconstructed form in the Pergamon Museum in Berlin is one of the most breathtaking objects in the world.
Babylon was the greatest centre of astronomical knowledge in the ancient world. The priestly astronomers of Esagila maintained observation records going back centuries — tracking the movements of the planets, predicting eclipses with extraordinary accuracy, developing the mathematical techniques that would eventually pass through Greek hands into the astronomical tradition that underlies modern science. The Babylonian astronomical diaries — clay tablets recording nightly observations alongside records of prices, weather and historical events — are among the most scientifically significant documents from the ancient world.
It was Babylonian astronomers who perfected the prediction of lunar eclipses using the Saros cycle — an 18-year pattern after which eclipses repeat. It was Babylonian mathematics that produced the first systematic approach to the calculation of planetary positions. And it was from Babylon that the twelve-sign zodiac, the horoscopic system of personal astrology and the planetary week spread westward through the Hellenistic world and eventually into the culture of the modern West. Every horoscope cast today is a Babylonian document.