The Highland School Time Capsule, which was placed in the cornerstone of the school in 1900, was opened on February 18, 1997.  Inside were autobiographies, letters, and poems written by the principal, teachers, and students of the Nonotuck School who would be transferring to the new Highland School.  Also found inside were letters by the architects of the new school.

This collection includes the original time capsule contents, a small amount of memorabilia from activities at the Highland School in the early 1900s, and photographs and news clippings from capsule opening day in 1997.