World’s most spectacular tunnels
Tags: building tunnels, emotional aspects of tunnels, history of tunnels, railway tunnels, road tunnels, safety regulation for tunnels, Tunnels, Tunnels disasters, Tunnels vs bridges, Why should tunnels be build?, world's longest tunnels, world's most famous tunnelsBy
Building tunnels is a peak of the construction art and science. Walking or going through a tunnel is a very impressive thing for many people, nevertheless they don’t think about that at the instant.
Fact is that building tunnels is not necessary a modern knowledge. Unbelievable, but true, there are man made tunnels which are very old. Very old, but not obsolete: an Iranian aqua duct serving for water transport is 5000 years old, and still in use! You don’t need to be a construction engineer for thinking about the difficulties of building a tunnel (alignment, evacuation of spoil,etc). I think those antic constructors are really to admire.
In the good old times the tunnels had mainly defense purposes, they were secret passages. Newer, in the modern times, things changed dramatically, but a tunnel remains a masterpiece.
