Describe a historical place you have been to

The historical place I've been to is the Cu Chi tunnel system, about forty kilometres north-west of Ho Chi Minh City. I went there on a school trip when I was maybe fourteen, and again as an adult about two years ago, which is the visit I actually remember properly. What I know about its history is that it was a network of tunnels used during the war — hundreds of kilometres of them, dug by hand, with kitchens and hospitals and sleeping areas underground. Some sections were three levels deep. What I saw was mostly a preserved section you can walk through, and this is the part that stayed with me: they've widened it for tourists. The original tunnels were much narrower. I'm not a large person and I still had to bend almost double for about thirty metres, and I came out sweating and slightly panicked. That was the widened version. In daylight. Knowing I could leave. How did I feel being there? Honestly, uncomfortable — and I think that's the correct response. Before going I had a fairly abstract idea of what living underground meant. Thirty metres of a widened tunnel replaced that abstraction with something physical. I'd recommend it, but not as a nice day out. It's more that it corrects something. You can't read your way to that particular understanding.