The Thames Tunnel was once known as the eighth wonder of the world.
In Victorian times, hundreds of thousands of Londoners flocked to see it - amazed at how they were able to walk beneath the river.
However, since becoming part of the East London Line, the public rarely get a chance for a close-up look at the Brunel engineering masterpiece.
But this weekend, with the London Overground closed for upgrading works, Transport for London opened the tunnels to the public.
Source:
BBC News
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