Grand Isle Schoolhouse #4 was built in 1814 and was also known as the Block Schoolhouse. It was constructed of foot-thick, squared-off logs laid like a log cabin with lime-and-sand mortar. One- and one-half-inch thick planks were nailed vertically on the outside of the logs, and clapboards were nailed onto the planks. The logs can be viewed through a stove air vent on the outside south wall. Alterations were made in the 1930's to conform to state standards by adding larger windows and electricity. A study by the University of Vermont in 1989 revealed that the original exterior color was yellow ochre. Originally located one-quarter mile east of Grand Isle Corners on the south side of the road now known as East Shore Road North, it was moved to the grounds of the Grand Isle Elementary School in 1954 and became a functional school building. In 2003, the Grand Isle School Board donated the schoolhouse to the Grand Isle Historical Society, and in late November of that same year it was moved to its present location. It is open to the public during summer hours, hosts public lectures and programs of the Grand Isle Historical Society, and occasionally serves for eighteen hundreds role-playing classes conducted by a retired teacher for students on field trips from nearby elementary schools.