Heritage House is the second oldest building in Elizabethtown. The one-and one-half story building was built around 1750. It's original location was situated in a different location, possibly on the Elizabethtown Square. The building was dismantled and brought to its present location, where it was served as a tenant house.

The Seibert Library and Resource Center is now located here. The museum also owns the two adjacent log buildings. The library collects and preserves oral histories, documents, writings, photographs and videos relating to the people and history of the greater Elizabethtown area.