We often visit Greenwich and the easiest way to get there is under the river Thames through the 100 year old Greenwich foot tunnel. It can be a bit scary for dogs to walk down the old dark spiral staircase, but there is also a lift if you don't like the stairs. Odo never liked these kinds of stairs, we found that out when visiting a castle in Germany, but as he trusts us, he now walks down them without a problem, and Mirabelle will do anything that is put before her.