The most impressive and tricky tunnels in the world

I'm always amazed at the capability of engineers and work crews that built tunnels under rivers many years ago such as the Detroit tunnels , one for trains and another for vehicles, as well as those constructed through mountains in Europe etc. When drilling from opposite ends I wonder if any did not join properly using the surveying equipment at that time

I agree with Ian and Ruthanna, the Sequoia tree in California was damaged in the fires and winds. It fell in January, 2017 and shattered due to being partial dead.

The tunnel in Whittier Alaska is the oddest one I have seen. It is a one lane vehicle tunnel and has the railroad tracks for the train to come and go to town as well. It has traffic lights on each end. You can go in on one half hour and go out on the other half hour. The train takes precedence though so everyone has to wait for the train. The only other ways into Whittier is by boat or plane! And boy do they get the snow!

The Spiral Tunnel at the Kicking Horse Pass in the Canadian Rocky Mountains is another amazing tunnel. Indeed it is designated as a National Historic Site, and is quite something to view

Great, thank you

What about the Lincoln & Holland Tunnels?

These tunnels are amazing, I would love to see them all.

Ian - the Sequoia tree tunnel you are thinking of was the drive-thru one. It was rather narrow as it was cut when cars were a lot smaller. I think the tree got so old and rotten that they had to take it down.

Worked in the Eisenhower tunnel in the 70's

What about the Cascade tunnel in the Washington Cascades? It used to be the longest tunnel in the world.

Great pictures but I agree, more information is needed.

I thought the Sequoia tree was destroyed in a very bad storm or is this another sequoia tree? I agree there is no information at all about some of these tunnels and there should be. I can think of other tunnels that could be added to this list - the tunnel from Copenhagen in Denmark to Malmo in Sweden, the train tunnel under the Gotthard Pass in Switzerland, the new tunnels built over, under and around all the obstacles in London for the new tube lines - Jubilee and Elizabeth and the Crossrail system.

Veronics Moss, Sequoia national Park is doable for most people in the US.

The sequoia tree title used to be big enough to drive a car through, when cars were small. I think you can still drive a model T Through it.

Information on the tunnels would have been good, just names and locations do not tell us much.