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Building/landmark answers:

What is the longest tunnel (of any kind) - 8,8

Google would suggest Thirlmere Aqueduct which is 9,8 but I have been assured by the quiz setter that the answer IS 8,8

DELAWARE AQUEDUCT fits the pattern though, as I'm sure Google has confirmed, is about 10 miles shorter than the Thirlmere one...

How is an aqueduct a tunnel ? The Pontcysyllte certainly isn`t. nor the Roman one in France whose name escapes me. Mags.

It just means "water carrier". It isn't a "tunnel" if it is open to the air, but underground?

That would be Le Pont du Gard which, I believe, was enclosed at the time.

Thanks Chrise and Musouk. I love this forum - I learn something new every time ! mags.

cheyenne mountain has a cold war nuclear bunker but i guess that it is a system of tunnels or just big rather than long.

I think the Thirlmere aqueduct goes through our golf course!

nice discussion but any more poss answers? LOL

Do I believe my eyes !!! An aquaduct is a water carrier which could make use of many sorts of mediums; one of which could be a tunnel, but at a paltry 8.8miles can hardly be significant.
Two tunnels with far greater lengths immeadiatly spring to mind: thefirst is the northern line on the London Underground which at one time held the record for the longest tunnel and second is the Channel Tunnel (Folkesstone to Sandgatte in France) which is in excess of twenty-one miles. I also have a sneaky suspicion that those crafty Japanese have a tunnel even longer than these two.
Best Regards, Lord Hawksmill VII.