Already in the late 1500's, thanks to reports of foreign missionaries' to Europe, it was known internationally as "One of the Greatest Castle Citadels on Earth", extending 1.6 km east-west, and 2.8 km north-south, having outer, central and inner moat systems.

In 1610, Tokugawa Ieyasu constructed Nagoya Castle. Many local castles were destroyed in favor of the new Nagoya Castle, and much of the stonework from Kiyosu's walls, as well as timbers from the various structures, were utilized. Kiyosu Castles' main keep was dismantled, and reconstructed as a turret on the north-western corner of Nagoya Castle, overlooking the moat.

Kiyosu Castle was reconstructed in concrete in 1989 across the small river from where the actual castle stood. The site of the keep now has a small tearoom and resting place on it, and an armor workshop where you can try on suits of samurai armor. Shockingly, the JR train lines and Bullet Train lines run directly through the old castle site, which is now a park featuring a fine statue of Nobunaga in full armor.

The current reconstructed Kiyosu Castle is now a symbol of the city of Kiyosu, and a well planned museum featuring some fascinating displays and interesting artifacts regarding the castles’ history, and its important role in history. Take the time to cross the red bridge out front to see the actual castle site on the other side of the river too. The surrounding area retains some historical sites, old dwellings and warehouses which can be visited with help of a Kiyosu History Walking Map, available at the castle.