1. Cu Chi Tunnels are an extensive network of tunnels located in the Cu Chi district of Ho Chi Minh City, Vietnam. The tunnels were used by the Viet Cong during the Vietnam War as hiding spots during the day and military bases at night. The tunnels were also used as communication and supply routes, hospitals, and living quarters for the soldiers.

Visitors can explore a small section of the tunnels and see the different traps and weapons used during the war. The tunnels are a popular tourist attraction and provide a unique insight into the history of the Vietnam War.

2. The Cu Chi Tunnels are open every day from 7:00 am to 5:00 pm. The phone number for the Cu Chi Tunnels is +84 28 3596 7744.

3. Tickets for the Cu Chi Tunnels can be purchased at the entrance. The price for adults is 110,000 VND (approximately 5 USD) and for children it is 55,000 VND (approximately 2.5 USD). Transportation options include hiring a private car or joining a tour group. Visitors can also take a public bus or taxi to the tunnels.