This is a phenomenal museum and history complex, located over part of the very historic Portsmouth…read morenaval dockyard. It is the single best place to explore Britain's naval history. Is has numerous displays and museum rooms with various collections covering many aspects of the naval history. However, the parts which really stand out are the ships and of these HMS Victory, the flagship of Horatio Nelson at the Battle of Trafalgar in 1805, and the HMS Warrior, the world's first all-metal "ironclad" warship, are probably the most amazing to visit.
HMS Victory, launched in 1765, is a one-of-a-kind surviving example of of a "first-rate" ship of the line, the only example of this type which has survived intact, and the oldest ship still in commission. It would be fasinating and well worht seeing for this alone. However, it is all the more memorable, and moving, for its role in the Battle of Trafalgar, and the with locations where Nelson, Britain's most revered and famous admiral, both was shot in the battle and later died from his wounds, marked.
HMS Warrior was not the first ironclad - the French Gloire just preceded it by about 1 year - but it was the first all-metal, purpose built ship of this kind, the Gloire being wood sheathed in iron. It was revolutionary at the time and it is fascinating to see the state-of-the-art innovations which it included for the first time, such as a steam-powered laundry with washing machines. Comparing the conditions on it and Victory is fascinating. It is lso the oldest ironclad still extant.
Others include HMS Mary Rose, a famous 16-th century warship which sank, HMS M.33, a WWI monitor (gunship) which served various roles, and HMS Alliance, a WWII submarine. One could spend all day here and still have more to explore.