🇴🇲 Oman · Buried city
Iram of the Pillars – Ubar, Atlantis of the Sands (Hypothetical)
Iron Age to Late Antique (1000 BCE – 500 CE) · Arabian frankincense / South Arabian / Parthian
Qur'anic Iram dhat al-'Imad — 1992 SAR identified Shisr 8-tower limestone fortress collapsed into sinkhole c. 500 CE (contested as Ubar).