Fortifications of Portsmouth
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The Fortifications of Portsmouth are extensive, due to its strategic position on the English Channel and role as home to the Royal Navy. For this reason Portsmouth is the most fortified city in the United Kingdom.
The city and harbor's main fortifications consist of the Palmerston Forts in the Solent, the line of Forts situated along the top of Portsdown Hill, forts in Gosport and the Hilsea Lines.
Other fortifications include Fort Cumberland, Southsea Castle and the Round tower at the entrance to Portsmouth harbor.
Old Portsmouth was originally a walled town. Of the four gates, only Landport Gate survives in its original position. Lion Gate and Unicorn Gate have been re-erected slightly further away.