Fort Sinister (Books)

Fort Sinister is a fortress owned by the Romans (How to Speak Dragonese). Hiccup, Fishlegs and Camicazi are held prisoner there as part of a plan hatched by Alvin the Trecherous.

Layout
Fort Sinister has many ammenites such as;
 * Observation Ballons as a look out for any unusual activties such as; escapees and war partys.
 * Dragons Cages.
 * Soldiers Barracks.
 * Fat Counsel's Headquarters.
 * Prison Tower this is were Hiccup, Fishlegs and CamiCazi are imprisoned.
 * The Great Amphitheatre were games are held.

Other Appearances
Fort Sinister is mentioned in How to twist a dragons tale as being torn down and as being abandoned by the Romans. It is also the place were Alvin nursed himself back to health after the incident with the sharkworms.