We know that these nomadic merchants became very rich as desert traders, and slowly gave up their goatskin tents to build the grand houses and monuments that became Petra. But it is a mystery why these people gave up their nomadic life to settle down in one place. The nomadic Nabataeans settled in the city of Petra.

The ancient city of Petra in modern-day Jordan was primarily built by the Nabataeans, a nomadic Arab tribe, starting around the 4th century BC. They chose this rugged, mountainous location because it was a natural fortress that sat at the crossroads of major trade routes for incense, silk, and spices. The Nabataeans grew incredibly wealthy by taxing the caravans passing through and used that wealth to carve magnificent structures, like the Treasury (Al-Khazneh) and the Monastery (Ad-Deir), directly into the rose-red sandstone cliffs. They weren't just builders but master hydraulic engineers, creating a sophisticated system of dams, cisterns, and conduits to harvest and store rainwater in a desert environment where water was scarce. This ability to control water allowed them to support a population of over 20,000 people and flourish as a regional power for centuries. While the Romans and Byzantines later added their own theaters and churches, the core "Lost City" remains a testament to Nabataean ingenuity, built as a grand capital to showcase their wealth and protect their trade monopoly from rival empires like the Greeks and Romans.