Petra, Jordan: The Archaeology of the Rose-Red City
Petra, in the Wadi Araba of southern Jordan, was the capital of the Nabataean kingdom from roughly the fourth century BCE until the Roman annexation of 106 CE. It is built into a landscape of multicoloured sandstone canyons and cliffs in which the Nabataeans carved hundreds of tomb facades, ceremonial halls, and temples directly from the rock — creating an urban architecture unique in the ancient world. The city was continuously occupied through the Byzantine period and into the early Islamic era before its gradual abandonment, and was not widely known to western scholarship until Johann Ludwig Burckhardt reached the site in 1812. It is a UNESCO World Heritage Site and one of the most visited destinations in Jordan.
The Nabataeans
The Nabataeans were an Arab people who controlled the trade routes of the Hejaz and the Negev from the fourth century BCE onwards, enriching themselves through taxes on the caravan trade in incense, spices, silk, and metals between Arabia, the Mediterranean, and the Persian Gulf. Their kingdom at its greatest extent encompassed southern Jordan, the Negev desert, the Sinai Peninsula, and the Hejaz of north-western Arabia. They were sophisticated merchants and hydraulic engineers who created a complex water collection and storage system in an otherwise arid landscape.
The Nabataean script was a cursive form of Aramaic that developed into Arabic script; Nabataean inscriptions are found across a vast region from the Hejaz to the Hauran in Syria. The Nabataean language and culture represents one of the bridges between the Semitic world of antiquity and the Arabic-speaking world of the Islamic period.
The Siq and the Treasury
Most visitors enter Petra through the Siq — a narrow, 1.2 km-long slot canyon carved by geological processes and modified by the Nabataeans. The canyon walls carry votive niches, carved blocks, and the remains of a Nabataean water channel that brought water from the Ain Musa spring into the city. At the end of the Siq, the first sight of Al-Khazneh (the Treasury) — its rose-red facade catching the morning light — is one of the most dramatic architectural reveals in the world.
The Treasury is actually a royal tomb or mausoleum, almost certainly of the first century BCE or early first century CE. Its two-storey Hellenistic facade, approximately 40 metres high and 25 metres wide, is carved with Corinthian columns, eagles, griffins, Amazons, and the goddess Isis-Tyche at the centre of the upper tholos. The interior consists of three simple rooms with no decoration — the artistic effort was entirely focused on the facade, visible to those approaching along the processional Siq. A small urn at the top of the upper tholos was shot by Bedouin who believed it contained the Treasury's gold; it is solid sandstone.
The Monumental City
Beyond the Treasury, the Siq opens into the broader central valley of Petra, where the monumental city — largely built rather than carved — occupied a flat area now known as the colonnaded street. The colonnaded street was a Nabataean commercial street subsequently rebuilt in Roman style after 106 CE; its surviving column drums and architectural fragments give a sense of the scale of the urban centre. The Temenos Gate leads to the Great Temple, a large Nabataean temple precinct excavated by Brown University since 1993; the excavations have revealed successive phases of building and a small theatre of unusual form within the temple complex itself.
The Kasr al-Bint (Palace of the Pharaoh's Daughter), still standing to 23 metres on the western side of the colonnaded street, is the most substantial freestanding Nabataean structure at Petra. Its function is debated — it may have been the main Nabataean temple or the royal palace.
The Tombs
Petra's most visually dramatic architectural tradition is its rock-cut tomb facades, of which over 500 survive. They range from simple doorway niches to elaborate multi-storey compositions influenced by Hellenistic, Egyptian, and Assyrian architectural vocabulary. The Royal Tombs on the eastern cliff face — the Urn Tomb, the Silk Tomb, the Corinthian Tomb, and the Palace Tomb — represent the peak of this tradition, probably dated to the first century BCE to first century CE. The Urn Tomb was converted into a Byzantine church in 446 CE; a Greek inscription recording this conversion is still visible inside.
The tomb interiors contain carved loculi (shelf-graves) and sometimes central burial chambers; the Nabataeans practiced both primary burial and the secondary collection and redeposition of bones. Grave goods found in less-disturbed contexts include pottery, glass vessels, and coins.
The Water System
The survival of a city of perhaps 20,000 people in an arid landscape without a natural river was possible only through an elaborate water management system. The Nabataeans constructed a network of cisterns, channels, pipes, and dams that collected rainwater from flash floods in the surrounding wadis, filtered and stored it in rock-cut cisterns, and distributed it to the city through terracotta pipes. The hydraulic engineer Nora Khoury has documented over 200 cisterns in and around Petra; the system is estimated to have stored over 12 million litres of water — sufficient to supply the city through the dry months.
Roman Petra
After Roman annexation in 106 CE, Petra became the capital of the province of Arabia Petraea and received substantial Roman investment in urban infrastructure: the colonnaded street, a nymphaeum (monumental fountain), baths, and possibly a circus. A Roman legionary camp was established on the plateau above the city. The city remained prosperous through the second and third centuries CE but declined from the fourth century as trade routes shifted and a catastrophic earthquake in 363 CE damaged much of the built infrastructure.
The Byzantine and Islamic Periods
A Byzantine administrative and ecclesiastical presence at Petra is well documented: the Urn Tomb-church inscription of 446 CE, a series of Byzantine churches excavated in the 1990s (including the Petra Church and the Ridge Church), and the extraordinary Petra Papyri — 152 Greek papyrus documents of the sixth century, found in a burning event in the Petra Church in 1993, recording the property transactions of a local family over several generations. The documents provide the most detailed picture of late antique provincial life at any Near Eastern site.
Visiting Petra
Petra is reached from the town of Wadi Musa, adjacent to the site, which has extensive tourist accommodation. Entry to the site requires a ticket (day tickets and multi-day tickets available). The main trail from the Siq through the Treasury to the colonnaded street and beyond takes a full day; the High Place of Sacrifice, reached by a two-hour climb, offers views over the city from the Nabataean hilltop ritual installation. The Petra Archaeological Park museum near the visitor centre has the best available collection of Nabataean material. The site is open year-round; spring and autumn are the most comfortable seasons; midsummer heat in the canyon can be intense.