Context: On the northern outskirts of the city, Crownhill Fort is a well restored example of a "Palmerston's Folly". It is owned by the Landmark Trust and is open to the public.

Question: What structure was referred to as a "Palmerston's Folly"?
Answer: Crownhill Fort

Question: In what cardinal direction is Crownhill Fort located outside the city?
Answer: north

Question: Who runs Crownhill Fort?
Answer: the Landmark Trust