Palmerston Forts
Many island forts off the coast of Britain were built during Victorian times to offer some type of resistance to the French invasion. Later, these forts were useful in serving as defense stations during World War I. During this time, some thought they could serve as a line of protection against submarine threats. After this, some forts were kept open, but these closed due to disease on the island.
Ghost Fleet, Suisun Bay
In Suisun Bay, which is off the coast of San Fransisco, California, an abandoned fleet of U.S. Marine war ships once floated together on the water. This Ghost Fleet used to be a strong 50 abandoned ships, until the environmental hazards of decaying ships and chipping paint led the removal of most of the ships to museums and junkyards.