An explorer's guide to the islands of Britain

Walking Greenwich Tunnel

Walking through Greenwich Tunnel feels like you are entering a part of hidden London. It’s there for all to use, but relatively few take the 370 metres walk under the Thames between Millwall on the Isle of Dogs and Greenwich. It is a truly feat of Victorian engineering. With glazed domes decorating both ends, helical staircases and a sloping tile-lined tunnel it is the best way of crossing the Thames from south to north.

The tunnel is free to use and if you are walking around the Isle of Dogs, you can transport yourself next to the Cutty Sark and the restaurants of Greenwich in just a few minutes. Access is via steps or lifts. The tunnel is also part of the UK’s National Cycle Route 1 linking Inverness and Dover. The tunnel entrance is in Island Gardens, Isle of Dogs (GR TQ 383 782; what3words grabs.punk.entertainer)

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