Extended content:
1. Reservation system: In order to control the number of tourists, Yungang Grottoes has implemented an appointment system, and tourists need to make an appointment in advance within a specified time period. This can effectively avoid the excessive number of tourists and ensure the quality and safety of the visit.
2. Time limit of visit: In order to protect the cultural relics in the grottoes, the management department limits the visit time of each visitor. Generally speaking, tourists are required to complete the visit within a certain period of time to avoid unnecessary wear or damage to the grottoes caused by long-term stay.
3. Restrictions on tour guides: In order to better protect the cultural relics and environment in the grottoes, Yungang Grottoes also restricted the number of tour guides to ensure that tour guides can effectively explain and guide tourists and avoid overcrowding.
In short, although there is no quota in Yungang Grottoes, the management department can effectively control the number of tourists and protect the grottoes' cultural relics and environment through measures such as reservation system, visit time limit and tour guide limit. This will ensure the experience of tourists and protect the precious cultural heritage of Yungang Grottoes.