The Richat Structure, a mesmerizing geological wonder in the Sahara Desert, is also known as the Eye of the Sahara. Measuring 40 kilometers (25 mi) in diameter, this dome-shaped formation exhibits a stunning array of concentric rings, exposing layers of sedimentary rock sculpted by time and erosion. Its unique shape has inspired theories among some alternative researchers that it could be the fabled lost City of Atlantis. Framed, Canvas or Poster Print.