It takes two to three hours to play in Wanxiang Cave in Longnan. When visiting Vientiane Cave, you can visit the main scenic spots in the cave and enjoy the magnificent stalactites and stalactites. At the same time, we can also understand the formation and evolution of caves and explore strange geological landscapes. The Vientiane Cave in Longnan has a peculiar landscape and a large area, so it takes 2 to 3 hours. Longnan Vientiane Cave is a famous scenic spot in Longnan City, Gansu Province, China, and it is a huge natural cave. There are all kinds of stalactites and stalactites in the cave, and their forms are ever-changing and amazing.