From a mud-brick walled oasis town along desert trading routes, Riyadh - which means "garden" in Arabic - is now one of the richest cities worldwide. Soak it all up, because you'll leave the city lights behind as you set off on a 4x4 adventure into the "Empty Quarter", the largest sandy desert in the world. You'll visit one of the Kingdom's cultural centres, Al Hofuf, which sits on one of the largest oases on earth. As we enter Oman, we'll visit various UNESCO sites, camping on Omani farms along the way. Walk the famous "Balcony" with views of Wadi Ghul, Oman's very own "Grand Canyon"; explore the ancient souqs of Nizwa and Ibra, and dust off in the water holes of Wadi Khalid and Wadi Shab. Our last night before Muscat is a magical one, spent searching for endangered Green Turtles at Ras Al Jinz, before we head to the capital.