English: Heading to the Dockyard Pier to get on the boat for Harbour Tours at Portsmouth Historic Dockyard.

View of the The Lion Gate / Semaphore Tower from the Dockyard Pier.

The Lion Gate. Grade II listed building.

The Lion Gate, Portsmouth

   SU 6200 SE SOUTH RAILWAY JETTY
   HM Naval Base
   The lion Gate
   774-1/18/235

   GV II

   Town gate, now naval entrance way. 1778, dismantled C19 and re-erected in present position 1929 (date stone). Ashlar. Central round archway with tripartite keystone and voussoirs aligned to the courses of the rusticated ashlar surround. Flanking paired pilasters with vermiculated bands support cornice and pediment in which is lion couchant bearing flag. To either side a similar pedestrian archway with round window over. On right side of central arch is block inscribed "The lion Gateway Portsea. Built 1778. Incorporated in this building in the year 1929". The present appearance of the entrances owes much to the 1929 rebuilding. The archway was originally erected as one of the town gateways of Portsea (Lloyd).
   (Source: The Buildings of England: Lloyd D: Hampshire and the Isle of Wight: Harmondsworth: 1985: 410).

   Listing NGR: SU6299200361

This text is a legacy record and has not been updated since the building was originally listed. Details of the building may have changed in the intervening time. You should not rely on this listing as an accurate description of the building.

Source: English Heritage

Another site says that this is also the Semaphore Tower.

The control centre for Portsmouth Harbour. In 1913 Sempahore Tower was destroyed by fire. It was rebuilt and now incorporates the resited Lion Gate. It is the Head Office of the Naval Base Commander and Queen's Harbour Master.

Semaphore Tower is not accessible to the public as it is situated in the Naval Base.