Kumamoto Castle is known for being one of the three great castles in Japan. Also known as Ginkgo Castle, the castle was built by Kato Kiyomasa in 1607. The castle's grounds cover about 980,000m², with the outer circumference being about 9 kilometers (at the time of construction). The castle is made up of curving stone walls, a castle keep consisting of 3 towers, 49 turrets, 18 turret gates, and 29 castle gates.

The main keep was destroyed in a fire during a civil war in 1877. The current keep was rebuilt by Kumamoto City in 1960.
The castle grounds are home to 800 cherry blossom trees of 3 different species: wild cherry blossoms, Higo cherry blossoms and Yoshino cherry blossoms. When these trees are in full bloom the castle park remains open at night and attracts over 100,000 visitors who come to see the beautiful flowers.