My rating:
The old city hall, now the national library
This building used to be the Nakhon Phanom city hall. It was built using convict labor in 1915. It was bombed by the French in the early days of World War II (either 1940 or 1941, depending on the source) and was left abandoned until the late 1970s, when its historical significance was recognized and renovation efforts began. It was turned into a branch of the National Library in honor of the king. The building is open Tuesdays to Saturdays, although the interior is not as impressive as the outside.