Interesting feature to have in a city, it reminds me of home grown fortifications like the barely visible Walls of Derry which are one of the best preserved in Europe and James’ Fort (left) and Charles’ Fort (right) in county Cork. James’ Fort has earthworks forming the star of its plan that you don’t see as well from the ground as you do from the air.
Also impressive and seemingly well kept is Bourtange in the Netherlands.
No, VarlosZ, many of them are warships. That was the location I had in mind in post #3.
Boston harbour is great for fortifications. Fort Warren and Fort Independence are beatiful examples of post-vauban angular bastions, the latter being an almost perfect pentagonal layout.
If you take a look, here, you can see several interesting pieces of Naval history. It’s Trophy Park at Norfolk Naval Shipyard, at Portsmouth, VA.
The easiest thing to recognize is the 16"/50 gun taken from a battleship. A little harder to recognize (and I can do it only because of the pointy nature of the shadow it throws towards the upper left corner of the park block in the center of the view selected) are the last visible remains of the USS Virginia CGN 38. Her forward missile launcher.
Not as interesting as some of the other links here due to the low quality, but this is an explosives testing range I used to work at. The north loop is where we did training for first responders (including a 500 pound carbomb, two to three times a week), while the southern loop is the sled track range. In the middle there is a boneyard, and if you zoom out a bit you can see the fire academy and another boneyard where Canyon Roads meet Canyon Drive.
Fort Brockhurst, Portsmouth
50°48’23.89"N
1° 9’29.77"W
Appears to be a moated fortification with a central gun pit for a large coast-defense gun. A wall surrounds the fort at the edge of the moat. A number of smaller automatic weapons position, possibly WWII antiaircraft posts are along the moat’s edge.
I think that’s one of the Palmerston Forts. The above mentioned Fort Nelson is another. It looks seriously cool. If you look carefully, you’ll see the others arrayed around portsmouth in various states of decay.
The wikipedia article mentions another a little to the east of that one, next to a small squadron of hovercraft, with what may be a dismantled Ekranoplan on the beach to the north of it.
It’s an interesting fort - now a museum and used as a venue for concerts (went to see James Brown there a few years back. The support band was the better part of the concert).
If you drive along the M4 motorway through Berkshire towards London, you see a mysterious exit signposted “Works Unit Only” - but with the sign in red on white, which is the colour scheme used for military signposts.
The “secret junction” actually leads to RAF Welford, a major munitions storage site. (More info here, down the page.)
Google Map here. Note the rectangular silos and the road leading southwards to the motorway.