The castle was originally built in the 14th century. It was abandoned in the 16th century, but - due to its strategic position - it was refortified later and in use up until the 19th century. Sold to a passionate historian in 1931, he attempted to maintain and restore it as faithfully as possible.

Due to its somewhat believable pseudo-medieval looks and its perfect condition, Fort-La-Latte was and still is a favorite location for shooting movies and TV shows. The most famous one is 1958's "The Vikings" with Kurt Douglas and Tony Curtis wherein it served as the location for the movie's final fight scene.

English Wikipedia article here.

I have to say, the aesthetic of a fortress built on top of a huge mossy grassy rock gets me every time. 14th century is plenty old enough for me.

I agree. It is definitely a beauty.