Fort Carroll

Fort Carroll is a 3.4 acre (14,000 m²) artificial island and abandoned fort in the middle of the Patapsco River, just south of Baltimore, Maryland. The fort was used in the 1800s. In WWII it was briefly used as a firing range for the Army and a checkpoint for ships

The government abandoned the fort as a military post in 1920, and the island was declared excess property in 1923. However, the War Department took no immediate steps to sell the land. In May 1958, a Baltimore attorney purchased the island for $10,000, but development plans never materialized. The fort now is deserted