Cu Chi Tunnels among the world's strangest underground destinations

The intricate tunnel system of more than 320 km long with full facilities serving life during the war in South Vietnam has amazed international tourists.

Cu Chi Tunnels, Vietnam:This unique attraction is located more than 30 km from Ho Chi Minh City, built during Vietnam's resistance war against the French. Photo: Lesrivesexperience.

The complex tunnel system, which stretches over 300km, contained living quarters, hospitals, supply lines and warehouses to support life during the war. The narrow entrance, once hidden under a carpet of fallen leaves, has now been widened so that visitors can explore inside. Photo: Visa2vietnam.

Catacombs of Paris, France:This is where the remains of more than 6 million people who died between 1785 and 1860 are kept. These bones are separated and arranged into corridors, doors, columns... Photo: Smithsonianmag.

The network of more than 300 km of ancient caves, tunnels and deep chambers, most of them filled with human bones, is visited by day. However, the catacombs have rooms for two visitors brave enough to spend the night.

Bounce Below, Llechwedd Mine, North Wales:The world's largest trampoline park is located in a giant cave at Llechwedd Mine, Blaenau Ffestiniog, with three large trampolines for visitors to enjoy. Photo: Thisiscolossal.

Bounce Below can be reached by train. However, each trampoline is located next to a 60-foot slide suspended over a deep chasm, so it's not for those with a fear of heights. Photo: CNN.

Salina Turda, Romania:This underground amusement park is located in one of the world's oldest salt mines in Romania. These mines were dug by medieval people to mine salt. Photo: Businessinsider.

The Salina Turda mine is now an amusement park with a carousel, theatre, bowling alley, mini golf and underground lake. Photo: Cartitaplimbareata.

Cabinet War Bunker, London, England:The late President Churchill ran politics from this bunker during World War II, staying here overnight when advisers deemed it too dangerous to return to 10 Downing Street. Photo: Amylaughinghouse.

These rooms only make up one-third of the 3,000-square-meter underground complex used between 1940 and 1945. Today, this place still preserves many interesting historical artifacts. Photo: Sightseeingtours.

Coober Pedy, Australia:Here, visitors will discover life underground, where more than 3,500 residents have built homes and many shops under the clay rocks of the Outback. Photo: Dailymail.

This underground town has houses, churches, museums, galleries, restaurants, bars, and even hotels for those who want to stay overnight. The houses here are fully equipped with built-in wardrobes, fireplaces, and kitchens. Photo: Urbanpeek.

Salt Cathedral, Colombia:Located 180m below ground, this church is a marvel, with statues carved from salt and a giant cross in the center. Photo: Famouswonders.

Now a tourist attraction, located in Nemocon, Cundinamarca, more than 90 km from the capital Bogata, the mine dates back 500 years and now welcomes around 3,000 visitors every Sunday. Photo: Paradiseintheworld.

Wieliczka Salt Mine, Poland:The Wieliczka Salt Mine is Poland’s largest tourist attraction, with hundreds of kilometers of tunnels. A sanatorium located deep underground here is popular with asthma patients, thanks to the pure, unpolluted air. Photo: Thedailybeast.

In addition, there is also a chapel, a ballroom, a restaurant, a shop..., all carved from monolithic salt rock. Photo: Grupafuntime.

The Vaults, London, UK:The Vaults hosts a variety of theatre shows, film screenings, golf and night events. Photo: Hirespace.

Located deep in the tunnels under Waterloo station, The Vaults Theatre has 176 seats with a classic, mystical atmosphere. It also has an art gallery and a kitchen for visitors. Photo: Vaultsbirmingham.

Located deep in the tunnels under Waterloo station, The Vaults Theatre has 176 seats with a classic, mystical atmosphere. It also has an art gallery and a kitchen for visitors. Photo: Vaultsbirmingham.

According to Zing.vn