Long Ting is an OK park with a half-decent reconstruction of a royal palace building. The view from the top of the Dragon Pavilion is quite good, but what you see is the new town buildings and the two or three reconstruction amusement parks that fill this area. There is nothing authentic here, but you get a basic idea of what Kaifeng may have looked like in the past.
I visited during the chrysanthemum festival, so the flowers were beautiful, but I would have been very annoyed at paying 70 RMB if it was not the festival, because there would have been a lot less to see in the park.
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