The large tower with its lion head corbels gives the castle its name. Like most castles, Lion Tower Keep has many layers of defense. The tower itself overlooks all the courtyards and other towers in the entire castle.

The tower, the great hall and the upper courtyard are built on a higher elevation and are reached through a single gate at the top of a narrow staircase. With it's own towers and battlements, the inner keep is a complete castle within the castle.

Counting the drawbridge and ramp, the castle is 37 1/2 x 20 inches (120 x 64 studs.) It features a working drawbridge, two gates, and several buildings in the ward. The keep itself has an enclosed gallery connecting the tower to the great hall.