Before the dunes swallowed everything, people lived here. Caravans carrying frankincense crossed the Rub' al Khali for centuries, threading routes between Arabia's southern coast and the markets of the ancient world. The trade flourished until roughly 300 AD, when advancing desertification sealed the paths. Somewhere beneath the sand lies Iram of the Pillars, a city -- or perhaps a people -- mentioned in the Quran as having been destroyed for their defiance of the Prophet Hud. Archaeological excavations have uncovered a fortification, walls, and the bases of circular pillars. Most remarkably, the ghost traces of ancient camel tracks, invisible from the ground, show up in satellite imagery -- commerce frozen in sand, visible only from orbit.

The terrain itself is staggering in scale. One thousand kilometers long and 500 wide, the desert's elevation drops from 800 meters in the southwest to nearly sea level in the northeast, a gradient that shapes enormous erg formations -- fields of wind-sculpted sand that shift and reshape with each season. But the real treasure lies deeper. South Ghawar, discovered in 1948, is the largest oil field in the world, its southern reaches extending into the Empty Quarter. The Shaybah field, found in 1968, sits squarely in the desert's interior. In 2021, a highway cutting through the dunes was completed, stretching roughly 700 kilometers from Ibri in Oman to Al-Ahsa in eastern Saudi Arabia, finally taming one corridor through terrain that defeated armies and explorers alike.

Westerners arrived late. Bertram Thomas made the first documented crossing in the early 1930s, followed closely by St John Philby. But it was Wilfred Thesiger, between 1946 and 1950, who mapped vast stretches of the quarter and wrote about it with the kind of haunted reverence the landscape demands in his 1959 book Arabian Sands. The crossings never stopped. In 1999, Jamie Clarke led a team of six -- guided by three Bedouins with 13 camels -- on a 40-day traverse. A 2006 Saudi Geological Survey expedition of 89 scientists discovered 31 new plant species and 24 bird species, proof that life persists where it seems impossible. In 2018, the first all-female walking expedition covered 758 kilometers of Omani desert in 28 days, led by Janey McGill alongside Omani women Baida Al Zadjali and Atheer Al Sabri.

The 21st century has turned the Empty Quarter into a proving ground for human endurance. In 2020, Italian explorer Max Calderan completed the first west-to-east foot crossing, covering 1,100 kilometers in 18 days. In 2023, an Austrian-German team documented a 1,500-kilometer southwest-to-northeast route through Saudi Arabia, exploring sites previously studied only by satellite. And in 2025, Gavin Booth and Adam Wilton hauled self-built carts carrying all their food, water, and supplies across 780 kilometers in 22 days -- the first fully self-sufficient foot crossing, with no resupply caches and no support team. Not everyone finishes. In 2024, Richard Midwinter walked 800 kilometers solo before being detained by Omani police on suspicion of espionage and removed from the desert. The Rub' al Khali does not care about your intentions.