An old marriage certificate of China is on display at an exhibition in Nanjing, Jiangsu province on August 17, 2015. The exhibition shows about 80 marital documents, including marriage certificates, divorce certificates and marriage restoration applications, from the late Qing Dynasty (1644-1911) to the 1970s. The oldest document was made 155 years ago. The show is held to mark the upcoming Double Seventh Festival (Qixi Festival) which is also known as Chinese Valentine's Day. (Photo: China news Service/ Dongfang Xu)