Since 1771 the fort has been home to a lighthouse.
 The current installation, the Portsmouth Harbor Light, was completed in 1878.
 Its Fourth Order Fresnel lens remains a valuable aid to navigation.
 The tower and the grounds immediately around it are open for scheduled tours.
Since 1771 the fort has been home to a lighthouse.  The current installation, the Portsmouth Harbor Light, was completed in 1878.  Its Fourth Order Fresnel lens remains a valuable aid to navigation.  The tower and the grounds immediately around it are open for scheduled tours.
Fort William and Mary