I am always on the lookout to find you some of London's best kept secrets, and I know that at first glance this might not appear to be one of them. But, stay with me on this ...Back in the 1970's the Welcome Trust had buildings on both sides of Euston Road. Being good employers they very aware of the challenges for their staff of trying to cross that crowded race track on foot. So they built a tunnel under the road for staff to dash back and forth in total safety. Nowdays they don't have buildings on both sides of the road, and the tunnel is no longer in use, with a strong door locking each side about half way.
Although you can't get into the tunnel, you can see part of the exterior of it if you go onto the platform at Euston Square underground. Look carefully and you will see a a section across the roof of the tunnel above the tube tracks. This is the floor of the tunnel.
