Gothic was a 14th century style. Fortresses like this were built up until about the 1500's. This was built 'for fun' probably in the 1700's. Soi it probably was never built as a real castle/fortress. Think of it as some rich person's very expensive lawn ornament.
In the Victorian era (late 1800s) the same thing became populare except instead of new castles the rich prefered ruins. They actually built ruins from scratch.
Castles 
In the Victorian era (late 1800s) the same thing became populare except instead of new castles the rich prefered ruins. They actually built ruins from scratch.
« On a hill above the gorge is a sham castle overlooking Bristol…»
http://en.wikipedia.org/wiki/Blaise_Castle