The cobble stone pathways weaving up and around and back down are endearing and exciting to explore. While you might not know exactly where the next cadde (street) will lead you, it's impossible to get lost in Mardin. The Main Street, fondly still called Birinci Caddesi (first street) even though several years ago it was formally renamed Cumhurriyet Caddesi (Republic Street). Birinci Caddesi holds within it many hidden pathways that lead to some of Mardin's best gems. Ulu Cami'i is one of those gems, colloquially called Büyük Cami (big mosque). Ulu Cami'i's minaret is exquisite with detail and script displayed on it that dates back to the 12th Century. Ulu Cami'i also has a somewhat strange display of a few hairs from the Prophet Mohammed's beard.