Fort Scott - Credit: Wikimedia Commons
Fort Scott was a detached lunette constructed in May 1861 to guard the south flank of the defenses of Washington during the American Civil War. It was named for General Winfield Scott, who was then General-in-Chief of the Union Army. An historic marker and a small remnant of the fort are the only evidence of the site of the fort on the grounds of what is now Fort Scott Park in Arlington County, Virginia. Read more on Wikipedia
Source: en.wikipedia.org