The Spinnaker Tower soars 170m above Gunwharf Quays, its two sweeping white arcs resembling a billowing sail from some angles, and a skeletal ribcage from others. The 23-mile views take in Portsmouth, the Isle of Wight and the South Downs. Observation Deck 1 has a hair-raising view through the glass floor, while the roofless Crow's Nest on Deck 3 allows you to feel the wind on your face.

Tickets are 15% cheaper when booked online.