Tianning Temple is one of Yangzhou's historic Buddhist sites and part of the city's Grand Canal heritage landscape. Its significance is tied not only to worship but also to Yangzhou's role as a cultured canal city visited by Qing emperors and shaped by salt wealth.
The temple is a good stop if you are already exploring the northern old-city sights. It is quieter than the famous gardens, but it helps fill in the religious and imperial side of Yangzhou's story.