The Jincheng Museum houses a permanent collection of archaeological finds from across the prefecture, including bronze ritual vessels, Han-dynasty ceramics, and a section dedicated to the coal and iron industries that shaped the region's pre-modern economy. Jincheng sits on some of China's richest coal deposits, and the museum explains how the coal and iron trades drove the commercial wealth that funded the great courtyard compounds in the surrounding countryside.
The museum is modern and well-organised, with Chinese-language labelling throughout and an occasional English caption on the most significant objects. It makes a sensible first stop in the city if you want context for the historical sites outside — the background on the Chen Tingjing family, the examination culture, and the fortified village tradition is helpful before you visit the sites themselves. Admission is free.