Horse Sand Fort or Horse Sands Fort is one of the larger Royal Commission sea forts in the Solent off Portsmouth, Hampshire, England. The fort is one of four built as part of the Palmerston Forts constructions. It is 200 feet across, built between 1865 and 1880, with two floors and a basement and armour-plated all round.
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Official Website https://solentforts.com/
Coordinates 50°45'0.506" N -1°4'20.463" E