The Brunswick-based Pejepscot Historical Society opens a new exhibit Friday about the history of downtown Brunswick and Topsham.

“Maine to Main: Downtown in Brunswick and Topsham” covers 150 years of history in the two communities, with photos, maps, documents and other objects. The exhibit follows the recent recognition of Brunswick’s commercial district by the National Register of Historic Places.

The exhibit is located at the historical society at 159 Park Row and runs through late December. It is open 10 a.m. to 4 p.m. Tuesday through Saturday. Admission is free.

Walking tours will be offered through the summer in connection to the exhibit.

The Topsham Historical Society also has exhibits in the town office and public safety building lobbies.

More information can be found at pejepscothistorical.org.