The Saka people inhabited this stretch of Sistan in the last two centuries BCE, but the city's built history likely begins in the Achaemenid period. The centerpiece is a three-storied Citadel Palace -- unusual in almost every respect. Its outer wall follows a serpentine path of baked brick rather than the straight lines typical of fortress construction. Its corners are not squared. It sits at the eastern edge of the citadel rather than the center, defying the conventions of defensive architecture. Archaeologists from the Helmand Sistan Project determined that the clay decorative elements lacked the elaborate designs found in the 11th- and 12th-century constructions of Mahmud of Ghazni and his successors, placing the palace's construction slightly earlier. That dating makes the Citadel Palace the sole surviving example of Saffarid-era monumental architecture -- a dynasty that ruled from Sistan in the 9th and 10th centuries but left almost nothing else standing.

In 1972, the Helmand Sistan Project team uncovered a mosque from the Saffarid period in the lower palace area. It is oriented with a qibla wall and mihrab on the west side, a porch on the east, and a central courtyard built with baked bricks. South of the mosque entrance, archaeologists found a commercial street containing a bazaar that had been rebuilt multiple times across different periods -- a palimpsest of trade stretching across centuries. A caravanserai stood across the street, evidence that Shahr-i Gholghola was not merely a military stronghold but a node on the trade routes that connected Central Asia to the Indian subcontinent. Merchants, soldiers, and pilgrims would have moved through these narrow lanes. Genghis Khan's soldiers destroyed the mosque along with much else in 1222, and coin hoards found along the bazaar, dating precisely to that year, confirm the violence of the conquest.

What made Sistan prosperous was not its soil or its climate but its engineering. The Zarkan and Zorkan canals diverted water from the Helmand River toward Chekhansur and Kang, irrigating Shahr-i Gholghola and the surrounding farmland. During the Islamic period, the people of Sistan built diversion and storage dams throughout the Helmand valley, developing water management expertise that sustained agriculture in an otherwise arid landscape. The Mirabi system of water distribution was particularly sophisticated, and experts like Bandabafan and Mir Aban Sistani were renowned for their precise understanding of stream gradients. This irrigation network transformed Sistan into what contemporaries called the granary of the region -- a designation that makes the subsequent destruction all the more devastating.

Destruction came not once but in waves. The Ghurids under Sultan Ala al-Din struck first. Then came the Mongol invasion of 1222, which demolished buildings, scattered populations, and wrecked irrigation infrastructure that had taken generations to build. But the final blow fell in 785 AH -- roughly 1383 CE -- when Timur besieged the nearby city of Zaranj with his vast army and razed it completely. Timur did not simply conquer Sistan; he dismantled its capacity to sustain itself, systematically destroying the canal network that made agriculture possible. His successor Shah Rukh Mirza restored some buildings, but the irrigation system never recovered. The mansions and canals built inside the outer defensive walls during the Timurid period were modest, almost improvised -- structures erected within fortifications that had already lost their purpose. Sistan, once the breadbasket of the region, never returned to its former prosperity. The ruins at Shahr-i Gholghola stand as evidence of what was lost: not just a city, but an entire way of sustaining life in the desert.