In 1751, Captain Michael Coutanch, a merchant, legislator, and commissioner for Bath and Portsmouth, built what is now known as the Palmer-Marsh House. It is Bath's oldest and largest colonial period residence. Robert Palmer, surveyor general, collector for Port Bath, and member of the Governor's Council, later owned the house. The Historic Bath Visitor Center offers tours of the Palmer-Marsh House.
Admission is charged for the guided tours.