Question: Which tower is found near Portsmouth Harbour railway station?
Context: Rowlands Castle railway station is a railway station serving the village of Rowland's Castle, Hampshire, England.  It is located on the Portsmouth Direct Line which runs between London Waterloo and Portsmouth Harbour. Whitstable Harbour railway station was the name of three disused railway stations serving Whitstable the terminus of the Canterbury and Whitstable Railway.  The line approached the harbour between Station Road and Clare Road, before curving west to the Harbour station around Tower Parade, and then the railway continued onto the harbour itself. Ryde Pier Head railway station is one of three stations in the town of Ryde on the Isle of Wight.  Situated at the end of the town's pier, it is adjacent to the terminal for the Wightlink fast catamaran service connecting the island with Portsmouth on the UK mainland.  Passengers can use this to connect with the rest of the National Rail network at Portsmouth Harbour station, which is adjacent to the Portsmouth terminal.  Through rail tickets for travel via Pier Head station are available to and from other stations on the Isle of Wight.  These include travel on the catamaran service to or from Portsmouth as appropriate. The Portsmouth Direct line is a railway route between Woking in Surrey and Portsmouth Harbour in Hampshire, England.  It forms the principal route for passenger trains between London and Portsmouth.  The name was derived unofficially, but has entered widespread use for the physical infrastructure between Woking and Portsmouth Harbour, and for the passenger train service from London over the route.  The final section of line from Havant to Portsmouth is shared by other passenger routes. Havant railway station is a railway station near Portsmouth, England, located on the Portsmouth Direct Line which runs between London Waterloo and Portsmouth Harbour.  Havant is served by trains operated by South Western Railway, Southern, and Great Western Railway. Portsmouth Harbour railway station is a railway station in Portsmouth, England.  It is situated beside Gunwharf Quays in the city's harbour, and is an important transport terminal, with a bus interchange and ferry services to Gosport and the Isle of Wight.  The station currently has four platforms in use: numbered 1, 3, 4 and 5.  It is managed by South Western Railway.  Platform 2 is no longer in use. Gunwharf Quays is an outlet retail destination with 90 outlet stores and 30 restaurants, pubs and cafés located in Portsmouth, UK.  It was constructed in the early 21st century on the site of what had once been HM Gunwharf, Portsmouth.  This was one of several such facilities which were established around Britain and the Empire by the Board of Ordnance, where cannons, ammunition and other armaments were stored, repaired and serviced ready for use on land or at sea.  Later known as HMS "Vernon", the military site closed in 1995, and opened to the public as Gunwharf Quays after six years of reconstruction (which included the restoration of some of the surviving 18th and 19th-century Gun Wharf buildings).  The landmark Spinnaker Tower, which also stands on the site, was opened a few years later. Petersfield railway station is a railway station serving the market town of Petersfield, Hampshire, England.  It is located on the Portsmouth Direct Line which runs between London Waterloo and Portsmouth Harbour. Southsea Hoverport is adjacent to Clarence Pier in the Southsea area of Portsmouth in southern England.  From here frequent hovercraft services leave for Ryde on the Isle of Wight.  The journey time is quicker than the conventional boats that sail from Gunwharf Quay, elsewhere in Portsmouth, but the hovercraft are more prone to service curtailment in inclement weather.  Another problem are connections from here as when the service first started in the mid-20th century much of the land closer to Portsmouth and Southsea station was already occupied by both residential and naval units.  To help alleviate this problem Stagecoach run the "Hoverbus" linking the terminal with Portsmouth and Southsea station and Portsmouth city centre.  The nearest railway station is Portsmouth Harbour railway station, although Portsmouth and Southsea station is not much further away. Liphook railway station is a railway station serving the large village of Liphook, Hampshire, England.  It is served by the semi-fast service on the Portsmouth Direct Line running between (London Waterloo) and (Portsmouth Harbour).  One train per hour in each direction calls at Liphook station at off-peak times.  Due to a short platform at this station, passengers must be in the front five coaches of a train to alight here.  The station is managed by South Western Railway, who operate all trains serving it.
Answer: Spinnaker Tower