Tour guides step on steel wires between cliffs of Laojun Mountain on the first day of the International Workers' Day holiday on April 29, 2018 in Luoyang, Henan Province of China. Steel wires and stairs have been built on a cliff edge of Laojun Mountain as a new tourism project in Luoyang. Tourists enjoy climbing on the cliff edge during the 3-day International Workers' Day holiday. (Photo by Wang Zhongjun/China News Service/VCG via Getty Images)
