It is worth visiting. You can experience the British maritime civilization. There are many venues, among which the remains of the Mary Rose ship are very shocking.
Well worth visiting Portsmouth. It may not be known for its tinu beach, but it compensates with its centre. Spinakker tower (I recommend booking an afternoon tea up there) and a boat trip (you can see a restored 19th century ship up close and many army ships). This is one of the UK naval army training bases, all included in the guided boat trip.
Loved Osborne House. The rooms are beautiful but you can also visit the kitchens and reception rooms. The traditional gardens are beautiful and the lawns are lovely to walk along to the private beach and other buildings. There is a shuttle mini bus to the beach and Swiss Cottage as it is quite a long walk to the beach. There is a small museum next door to Swiss Cottage which is full of historical artefacts collected or donated from all over the world - it is amazing. The house has a very rich history and I loved the room with the family tree. As Queen Victoria had 9 children, most of them were sent to different countries in Europe by marriage and their children and grandchildren became kings and queens of places that still had monarchies or had become republics. Very interesting