Re-join Mark and The Heart of Arabia Expedition Team at the ancient site of Old Diriyah, the birthplace of the first Saudi state, historical crossroads of pilgrims and traders. It is also where Philby left Riyadh behind and followed the Pilgram Road west to Jeddah. The terrain, climate and geology of the second leg of the expedition are very different to the first leg in the eastern deserts and Empty Quarter and this brings with it different challenges for the team. But their connection to Philby continues to grow and Mark immerses himself in Philby’s writing as they travel. For his original Heart of Arabia Expedition Philby was awarded the Royal Geographical Society’s Founders Medal in recognition of the field data he returned to London. Today’s RGS President, Nigel Clifford explains how significant a contribution to our understanding of Arabia’s geography Philby made. And finally Mark explains why the whole team - Reem, Ana, Alan and himself - spent several hours walking in circles looking like policemen! Expedition website: The Heart of Arabia Expedition Follow the Expedition on social: Twitter Instagram Facebook The Heart of Arabia Expedition podcast is produced by Adventurous Audio