London trivia - The Woolwich Free Ferry
I'd be surprised if very many non-Londoners could answer the question, "How can you cross the Thames if you don't use a bridge or a tunnel?" Even Londoners are not that likely to have travelled across on the Woolwich Free Ferry, but if you get the chance, it's a welcome change. It was first opened in 1889, and runs morning till night every day except Christmas and new year, except if its foggy and the captain can't see the far side. It used to be the most eastern crossing and very busy, you can still expect to see lorries queueing to cross, but cars don't normally have to wait that long (except in rush hour).