Portsmouth is mainly built upon Portsea Island and is the United Kingdom`s only island city. Visit Portsmouth to see all things nautical. Big boats dating back to Nelson and Tudor times are moored up for all to see at the historic naval dockyards. Portsmouth`s museums are very much in keeping with its maritime theme, covering Royal Marine history, D-Day, and sealife. Nauticalia done, the city`s Point district tempts with cobbled streets and ancient pubs, the Spinnaker Tower delivers jaw-dropping views, and the port makes a prime launch pad for the Isle of Wight. With its two cathedrals, strange nickname (Pompey) and its location being perched on an island, Portsmouth is a great place to be.