This was a worthwhile stop, just to give some impression of what old Nanjing was like. (Not very much of that exists now). At least three segments of the old Nanjing city wall still exist, and this is one of them. This part is particularly worth visiting because of the massive gate. The wall itself is not as impressive as the city wall in Xi'an, but it is still large, and particularly worthwhile seeing if you will not be visiting Xi'an. The various displays on what the gate looked like through the last 100 years or so were interesting. It was poignant to see the model and pictures of the massive wooden structure that use to be part of this gate. That structure lasted for several hundred years until it was destroyed in the Second World War. I was fortunate to be visiting shortly after the Chinese New year, so there were numerous floats installed on the wall depicting various eras in Chinese history. This had been part of the city's Chinese New Year celebration. The views over the city and over the nearby river were worthwhile, as well. This was part of a tour, so I can't comment on entrance costs nor how easy this would be to access by public transit (maps of the Nanjing transit system suggest it would be about a 1 km walk from the nearest subway stop). When I was there it was relatively uncrowded.

Zhonghuamen is for sure old and that way very precious but there is one big con. I visit that place after sunset, i pay 50 yuan entrance fee and climbing top of wall. gate was illluminate by different color lights and consist weird "i love you" signs etc.For me, whole place was ruined by trying make it place for ... do not know. If you like visit Nanjing city wall i strongly recommend Xuanwumen instead of this weird place.