NH, USA
New Castle Island
Landmark
New Castle is New Hampshire's only island municipality — a small island in Portsmouth Harbor connected by bridges. Its position at the harbor entrance made Fort William and Mary the gateway to Portsmouth, New Hampshire's most important colonial port. The island retains its colonial-era character, with 18th and 19th century houses lining narrow streets.
Visiting Today
Address
New Castle, NH 03854
Hours
Open daily
Admission
Free