This impressive line of artillery is in Willard Park on the grounds of the Washington Navy Yard. While most of the tubes were made on-site at the Naval Foundry and sent to Union Navy ships or land installations, the one second from the right served the Confederacy during the Civil War.
According to WIkipedia, the Washington Navy Yard is the oldest shore establishment of the U.S. Navy and currently serves as a ceremonial and administrative center, home to the Chief of Naval Operations. It is headquarters for the Naval Historical Center, the Department of Naval History, the Naval Criminal Investigative Service, the U.S. Navy Judge Advocate General's Corps, Naval Reactors, Marine Corps Institute, and numerous other naval commands.The Washington Navy Yard was added to the National Register of Historic Places in 1973, and designated a National Historic Landmark on May 11, 1976. nearly 400,000 people visit the U.S. Navy Museum annually.




