Driving around Portsmouth, NH at the end of last month we followed signs to Fort Constitution.
We parked in the designated parking spots, read this sign and
followed the blue line.
The fort is still government property and is on a Coast Guard base.
The fort dates back to pre-Revolutionary War times when it was called "The Castle" then Fort William and Mary.
It was captured by Patriots during the war, then taken back by British forces.
In 1808 it was renamed Fort Constitution.
We felt like we'd been here before because it resembles Fort George in Scotland but on a smaller scale.
It lies at the mouth of the Piscataqua River. Maine is across the river.
This lighthouse has been in use since 1878.
New Hampshire is the Granite State and that's not just because of the mountains.
The fort was used through World War II.
In fact where we parked was in front of these fortifications, left over from that war.
Read more on Wikipedia here