Nawras Riga, whose surname is shared with the Latvian capital, is a gray-haired radiologist in Syria's Aleppo. He wears a ring, almost two centuries old, on his finger. It's amber, and it's a souvenir from Latvia, passed from generation to generation in his family. He is also the owner of Riga Palace, a hotel in Aleppo, the only one currently kept open in the war-torn city.