Where in London could you touch an object that has never been touched by human hand before?
The inside pages of pretty much any newspaper or magazine freshly purchased. The process of pulping wood, manufacturing paper and printing are fully automated. It used to be said that the best thing to swaddle a new born baby (that other great answer) in – in the event of an ‘unexpected delivery’ outside the home or hospital was a fresh newspaper. You could also nominate any fresh plant shoot or leaf, a butterfly or any newborn creature, any butchered creature’s carcase, any operating theatre, and any freshly poured and set concrete. But I suspect you are talking about the ‘fabric’ of the city, the earth and stones, and the answer is probably ‘nowhere’ unless you are involved in excavating deep footings on major building sites. Roman London exist about 6 metres below ‘street level’, and you’d want to go another 3 metres to get clear of any pre-roman occupation sites. Anything below that (barring wells dug down from higher levels) should have a reasonable chance of being ‘virgin’ ground