A tunnel is an underground passageway. The definition of what constitutes a tunnel is not universally agreed upon. However, in general tunnels are at least twice as long as they are wide. In addition, they should be completely enclosed on all sides, save for the openings at each end.
Scotland, Edinburgh Underground Vaults
Some of the most fascinating attractions of Edinburgh are right under your very feet. As you tread the ancient Royal Mile – with its myriad of churches, souvenir shops, bars and restaurants – you could be forgiven for not realising the wealth of history and mystery underground.
Haunted far below the busy streets of modern Edinburgh lies a dark, forgotten corner of history. Discovered in the mid-1980’s, the Edinburgh Vaults had been abandoned for nearly two hundred years. Lying beneath the South Bridge, a major Edinburgh passage, the rooms were used as cellars, workshops and even as residences by the businesses that plied their trade on the busy bridge above. Abandoned soon after they were built due to excessive water and moisture, the vaults remain, unaltered, never illuminated by the light of day.
Underground Tunnels Vimy Ridge
A ruggedly beautiful park commanding the heights to the North of Arras. The ridge is wooded, each tree a native of Canada and representing the sacrifice of a Canadian soldier. Thousands of shell holes and mine craters testify to the intensity of the fighting that took place here. Fenced off areas and warnings of unexploded munitions bear witness to the destructive power of a war that ceased 80 years ago but still claims victims today.
One of the most interesting things to see at Vimy is Grange Tunnel. This is a network of underground passages, around which there are guided tours. These are only some of the tunnel networks that riddled this small part of the Western Front. They are astonishing. How many miles of tunnels were dug across the Western Front, and still remain under the ground?
Jordan, Amman, Shafa Badran
Amman is one of the oldest continuously inhabited cities in the world. The city’s modern buildings blend with the remnants of ancient civilizations. It sits atop seven hills, which are represented by the seven pronged star depicted on the Jordanian flag.
Here we can see a lot of big cube rocks, they were all over the hill, on which it is difficult to collect any information about this place, behind the hills can be found a lot of stone gates and walls. A ruins of a great architecture site, many rooms, under ground tunnels, what is this place, most people never heard of it. There are deep holes in the ground, inside this hole a cave, with a stone gate.
The Cu Chi Tunnels
Inside the Cu Chi Tunnels. This labyrinth of tunnels, which runs 75 miles long if placed end-to end, was a refuge for the North Vietnamese soldiers and their sympathizers during the Vietnam War.
The tunnels were used by Viet Cong guerrillas as hiding spots during combat, as well as serving as communication and supply routes, hospitals, food and weapon caches and living quarters for numerous guerrilla fighters. The role of the tunnel systems should not be underestimated in its importance to the Viet Cong in resisting American operations and protracting the war, eventually persuading the weary Americans into withdrawal.
Lost Crusaders’ Tunnels
For centuries it’s been said that the crusading Knights of Malta constructed an underground city on the Mediterranean island of Malta, sparking rumors of secret carriageways and military labyrinths.
Now a tunnel network has been uncovered beneath the historic heart of the Maltese capital of Valletta, researchers say. But the tunnels—likely from an ahead-of-its-time water system—may render previous theories all wet. The newfound tunnels are said to date back to the 16th and early 17th centuries, when the knights—one of the major Christian military orders of the 11th- to 13th-century Crusades—fortified Valletta against Muslim attack.
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