The ruins of Leuktron Castle sit on a low coastal hill just south of Stoupa, the partly preserved walls and towers of a Frankish fortress built in the mid-13th century. The site overlies the ancient Greek town of Leuctra and offers a long view across the Mani coast to the south.
The walk up takes about twenty minutes from the road. There is no admission charge, no guide, and limited signage — what you see is what you get: collapsed walls, a few cisterns, and Aegean light. Bring water and good shoes; the path is rocky.