From the World Heritage inscription:
The Brimstone Hill Fortress is of historical, cultural and architectural significance, a monument to the ingenuity of the British military engineers who designed it and supervised its construction and to the skill, strength and endurance of the African slaves who built and maintained it. In some of its architectural features, notably the Citadel, are expressed elements of different stages of fortress design; ?it is an embodiment of European imperialism, and the emergence of a distinctive Caribbean culture. It is indicative of the competition for power and wealth at a crucial stage in world history, and it provides a medium by and through which the geology, ecology and history of the Caribbean can be understood. As managed by a competent local organization on behalf of the people of a young nation, the majority of whose citizens are descended from former slaves, it is a symbol of a colonized African people and of the integrity of Caribbean culture, and as such it can be an inspiration to other young nations in a post-colonial era.
Known as Liamuiga (Fertile Island) to the native Amerindians, Saint Kitts was the first Caribbean island to be permanently settled by both the English (in 1623) and the French (1625), who shared it between 1627 and 1713, when it came under sole English control through the Treaty of Utrecht. Known as the ‘Mother Island’, it provided the model and springboard for English and French colonization in the Caribbean. African slaves were brought in from the earliest years of European settlement, and it was on Saint Kitts and the other early colonies that the plantation system, based on sugar production and slavery, had its roots.
Because of its reconstructed and very formidable defenses, Saint Kitts became known as the ‘Gibraltar of the Caribbean’. It successfully drove off an attack by the French Navy in 1806. From that time onwards the British Navy was able to ensure the security of its island colonies in the Caribbean. The fortress was abandoned as a result of British defense cuts in 1853. The wooden buildings were auctioned and dismantled and masonry buildings were plundered for their cut stone; natural vegetation progressively took over.
The Brimstone Hill Fortress is the only world heritage site in the Leeward Islands of the Caribbean. The island of St. Kitt’s (aka St. Christopher) was the home of the first English and first French colony in the Caribbean. Few original wooden buildings in the Caribbean remain. The stone structures of fortresses and some warehouses are all that remain of the former colonial past.
The fortress is far and away the best preserved historical site I’ve seen in the Lesser Antille, with only St. Eustatius coming close (and they should probably be a world heritage site also).
If you visit St. Kitts, the fortress will undoubtedly be on any tour you take as it is the touristic and historic highlight of the island.
If you are visiting from a hotel or resort, look into taking an organized day trip instead of renting a car. Gas on the island is very expensive and there is a $25 temporary drivers license that they charge on top of any car rental, which makes anything less than $75/day for a car impossible. You can easily book a day trip for half that amount that will visit the fortress.