Darius chose his location with a propagandist's instinct. The inscription sits roughly 100 meters up a limestone cliff beside an ancient road connecting Babylon to Ecbatana, the twin capitals of his empire. Every official, merchant, and soldier passing between Mesopotamia and Media would see it. The carving shows Darius life-sized, holding a bow as a symbol of kingship, his left foot planted on the chest of the pretender Gaumata, who lies supine before him. Nine captive figures stand to the right, hands bound, ropes around their necks, representing the rebels Darius crushed. Above the scene floats a Faravahar, the winged symbol of Ahura Mazda, bestowing divine approval. One figure and Darius's beard were added later -- the beard is actually a separate block of stone, fastened with iron pins and lead.

The inscription tells its story three times. The Old Persian text runs 414 lines across five columns. The Elamite version covers 260 lines in eight columns. The Babylonian text compresses the account into 112 lines. Darius's autobiography begins with his lineage, traces his coronation in 522 BC, and then details nineteen battles fought in a single year to suppress revolts across the empire after the death of Cambyses II. Each rebellion is named, each rebel identified, each victory attributed to the grace of Ahura Mazda. The redundancy was not literary indulgence; it was administrative necessity. The empire's subjects spoke different languages, and Darius wanted every one of them to understand exactly who was in charge and how he got there.

Henry Rawlinson arrived in Persia in 1835 as a British East India Company officer. The inscription consumed him. He scaled the cliff himself to copy the Old Persian text, a feat requiring both mountaineering skill and scholarly nerve. The Elamite text lay across a chasm. The Babylonian hung four meters above the accessible ledge. Rawlinson enlisted a local boy to reach the most dangerous sections, making squeezes and transcriptions that he sent to Europe in 1847. Working from these copies, Rawlinson and other scholars began to crack Old Persian cuneiform, building on earlier breakthroughs by Georg Friedrich Grotefend, who had deciphered ten of the script's 37 symbols by 1802. The Behistun Inscription became cuneiform's Rosetta Stone -- the trilingual key that made the entire written record of ancient Mesopotamia readable.

The inscription has survived 2,500 years of weather and considerably less time of human violence. Rainwater has dissolved portions of the limestone while depositing new layers over other sections, obscuring text that Rawlinson never copied. During World War II, Allied soldiers used the cliff face for target practice during the Anglo-Soviet invasion of Iran, adding bullet scars to the surface. In 1938, the Nazi think tank Ahnenerbe had planned its own research expedition to the site, though the war intervened. Twentieth-century damage prompted Iranian archaeologists to begin systematic documentation in 1999, using photogrammetry to create three-dimensional records of what remained. The site became a UNESCO World Heritage Site in 2006.

Without Behistun, we might still be unable to read Sumerian, Akkadian, or Babylonian. The inscription's trilingual format -- the same text in three cuneiform scripts -- gave scholars the leverage they needed to decode languages that had been silent for two thousand years. Expeditions by the British Museum in 1904 and the University of Michigan in 1948 recovered passages Rawlinson had missed and revealed the full scope of the text. In 2012, an international team organized by the Bisotun Cultural Heritage Center returned for yet another examination. The inscription keeps yielding new readings, new details, new corrections. Darius intended his words to last. They have outlasted his empire, his language, and the very ability to read them -- only to be recovered again, one painstaking symbol at a time.