Karatsu Castle is said to have been completed in 1602 after 7 years by Toyotomi Hideyoshi’s vassal Terazawa Hirotaka. The castle in its current form was completed in 1966. Also known as “Maizuru Castle,” it is a popular place for cherry blossom and wisteria viewing. There is a souvenir shop on the 1st floor. Castle renovations began in 2017, and are still ongoing.