This picture from a lithograph by A. Pernet is a detailed panorama of activity on Southsea seafront in 1865.
Apart from the paddle steamers taking tourists on pleasure trips, the army offficers riding on the common and the bathing machines protecting the modesty of those taking the waters, the scene is almost unchanged from what one sees today. The major exception would be that the pier on the left with its paddle steamer is today the landing place for hovercraft to the Isle of Wight.
This print is available from local maritime, naval & contemporary art dealers Artists Harbour. At a meter wide and under £30 this is a bargain.