It's pretty clear why you would consider Point Lookout, Maryland, a strategic place. Here, the Chesapeake Bay and the Potomac River meet.
Now it's a state park, with a campground, fishing, kayak rentals, great views, and deer flies. Captain John Smith landed in 1608, and the British raided during the Revolutionary War and the War of 1812.
In the 1850s, a private resort operated on the site. During the Civil War, the U.S. government soon eyed the land for its own uses. Maryland did not secede, although this part of the state was decidedly pro-Confederate. Nonetheless, the Union used the point for a hospital, fort, and, after Gettysburg in July 1863, prisoner-of-war camp.
Most famously, the Union's largest prisoner-of-war camp was hastily constructed and managed for about two years at Point Lookout. Conditions in both sides' POW camps were bad, with high rates of disease, deprivation, and mortality. Sadly, Point Lookout held with this low standard. An exhibit in the park's small museum includes a quote from a prisoner (many similar comments have made it through the years):
In the winter, a high tide and an easterly gale would flood the whole surface of the pen and it froze as it flooded.
A representative of the U.S. Sanitary Commission was likewise appalled:
As regards medicine and clothing, they are sadly in want of both and would suggest the commission send some....I know they are our enemies, and bitter ones, and what we give them they will use against us, but right now they are within our power and are suffering.
Ten thousand prisoners--double that by 1865--were crowded into 40 acres. They slept in overcrowded tents, surrounded by fourteen-feet walls. U.S. Colored Troops regiments rotated in and out to serve as prison guards. It's easy to imagine this as a deliberate taunt to the Confederate prisoners. Some prisoners' writings depict cruel treatment by the guards--whether they were particularly harsh, whether harshness comes with the job description, or whether race entered into this perception probably varied by individual guard and prisoner.
Fort Lincoln and Hammond Hospital
The Union also built a hospital that began with the resort building from the 1850s. It grew to a series of buildings in a circle like a wheel, as shown here. (The POW camp is up to the right).
The embankments around Fort Lincoln still exist. A guard house and barracks for officers and enlisted men were re-created.
During the Civil War, three cemeteries were built, two for the prisoners and one for the Union dead from the hospital. After the war the Union dead were moved to Arlington, The Confederate dead were moved outside the park in 1870, and in a mass grave. (It is claimed that many more died and remain unaccounted.) Confederate flags are displayed--a rather jarring sight on the way to the park and next to a government cemetery, but the parcel of land with the flags is owned privately.