Is there a museum in Union Vale? Historical landmarks?

There is a Museum at Tymor Park. It is run by the Union Vale Historical Society. The museum is open by appointment only. The Town's website should give you the current contact information fro the historical society www.unionvaleny.us The museum is not run or curated by the town.

The Oswego Meeting House and Friend's Cemetery, which was built in 1790, is on the National Register of Historic Places, and it's the only such landmark in town.

There aren't any museums in Union Vale to my knowledge. To my surprise, there aren't any official historical markers here, either, except for one in the Oswego section of town. This part of Union Vale was settled and then became a ghost town, and all that remains here is a sign. I wouldn't call that much of a historical landmark, though.