Tallest castle tower – surviving

The tallest castle tower still in existence is generally considered to be the Chateau de Vincennes keep, or donjon, which measures at least 50 m high, has a diameter of 6.6 m, and has walls 3.2 m thick. Located in Île-de-France, to the east of Paris, France, the keep was added to the original castle between 1336 and 1370 by Philip VI.

Osaka Castle in Chūō-ku, Osaka, Japan, measures 58.49 m high and was built in 1583–98. However, the building has been destroyed on two separate occasions, and the current measurable version is a concrete replica, constructed in 1995–97. It is unclear exactly how tall was the original castle.