And it is packed full of interesting facts to be discovered.
In 2012 Portsmouth historian John Sadden wrote Portsmouth – A Pocket Miscellany - a book crammed with curious historical facts.
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So we have pulled together a list of facts you might not know about our city.
Make sure to click through all the pages!
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1. This is how much area Portsmouth covers
The total area of Portsmouth is 4,028 hectares, or 9,954 acres, or 15.5 square miles. Photo: Habibur Rahman
2. Portis Mouth
Portsmouth appears on the oldest surviving route map of Great Britain, the Gough Map, which dates from about 1360 and shows 600 towns and cities. Portsmouth is labelled Portis Mouth and is represented by a single red-roofed building. Photo: Habibur Rahman
3. A bit of Portsmouth down under
It is 9,366 miles from Portsmouth to Uluru, the massive sandstone rock in central Australia that used to be known as Ayer’s Rock. It was named after Sir Henry Ayers who was born in Portsea in 1821, the son of a dockyard worker, and who was the premier of South Australia five times. Photo: Habibur Rahman
4. Portsmouth was first to do this
In 1917 Portsmouth was the first town in the country to open clinics for the free treatment of venereal disease. Photo: Habibur Rahman