The Historic Naval Cannons of Glen Island Park, New Rochelle, New York
Five historic cannons are displayed at Glen Island Park in New Rochelle, New York. Many thanks to friend of the page James Touza for sending these photos!
Glen Island Park, a park of Westchester, New York, was originally a resort developed by John H. Starin. The cannons and stone "castles" were part of the whimsical scenery of the resort.
Danish Rifled 18-Pounder at the Danish War Museum
Many thanks to Rob from the YouTube Channel FirearmsAddict for sharing these photos!
A Rifled 18-Pounder is displayed at the Danish War Museum in Copenhagen. The photos show a cast-iron tube manufactured in 1837 that has a reinforcing band (likely wrought iron or steel). I expect this gun was originally manufactured as a traditional 18-Pounder smoothbore. I also guess that the rifling and banding happened circa 1860.