Picture taken on July 6, 2018 shows the National Palace of Culture in Sofia, Bulgaria. (Xinhua/Zhang Liyun)
Picture taken on July 6, 2018 shows the National Palace of Culture in Sofia, Bulgaria. (Xinhua/Zhang Liyun)
Picture taken on July 6, 2018 shows the National Palace of Culture in Sofia, Bulgaria. (Xinhua/Zhang Liyun)
Picture taken on July 6, 2018 shows the National Palace of Culture in Sofia, Bulgaria. (Xinhua/Zhang Liyun)