The Langlade County Historical Society Museum was built as Antigo's library. It's a pretty building, but I haven't been able to find out much of what they house inside. I would imagine it is probably pretty typical old-fashioned rural Wisconsin paraphernalia.
On the grounds, there are also an old log cabin and a locomotive that are open for touring in the summer months.
Langlade County Historical Society
404 Superior Street ~ Antigo, WI ~