Chelmsford's One Room Schoolhouse.

Old Schoolhouses or One-room schools are found throughout rural portions of various countries like the United States, Norway, Spain, New Zealand, Australia, and Ireland. One teacher would teach the academic basics to several grades, all mixed from grades 1 through 8, boys and girls. The schoolhouse would also be sometimes used as the local chapel on Sundays, and evening/Saturday meeting area and used for activities. The schoolhouse was painted red in some locations like the one shown below.

The regular school day would be from 9am to 4pm with morning and afternoon recesses, both 15 minutes each, and an hour lunch period. A few notable students that went to one-room schools were Abraham Lincoln, Herbert Hoover, and Joyce Carol Oates.

I couldn't snap pictures of the inside due to it being closed but if you've want to know how it looks inside I left the link below. It is the first link.

I also snapped a photo of the United States flag with just 15 stars and 15 stripes. It was the only U.S flag to have more than 13 strips and was authorized by the Flag Act of January 13, 1794. The photo of the schoolhouse is located in Chelmsford, MA and is the first Chelmsford schoolhouse in 1802. Also it was the oldest Town-owned property in Chelmsford.

https://merriam1.smugmug.com/TownofChelmsford/1802-Schoolhouse-Restoration/
http://www.usflag.org/the.15.star.flag.html
https://en.wikipedia.org/wiki/One-room_school