Visitors wait for shuttle tram at Luxor Resort & Casino in Las Vegas, the United States, May 12, 2019. Las Vegas is located in the state of Nevada in the west of the United States. It is most commonly known for its gambling resorts and nightlife. It is not only popular for leisure travelers, but also a hub for business, conventions and meeting. According to Las Vegas Convention and Visitors Authority, about 42.12 million people visited the city in 2018. (Xinhua/Han Fang)