If the Tulip is ever built, it will enter the rarefied group of high-profile observation towers across the world.Unlike Toronto鈥檚 CN Tower or Berlin鈥檚 Fernsehturm, these towers are principally built to provide an observation deck rather than for aerial or communication purposes. As such, they are usually conceived as architectural works with dynamic visual form, as well as projects with structural and engineering prowess.

The Tulip. Location: London, England. Designed by: Foster + Partners. Year built: Construction not started. Height: 305.3m. If the Tulip is ever built, it will enter the rarefied group of high-profile observation towers across the world.Unlike Toronto鈥檚 CN Tower or Berlin鈥檚 Fernsehturm, these towers are principally built to provide an observation deck rather than for aerial or communication purposes. As such, they are usually conceived as architectural works with dynamic visual form, as well as projects with structural and engineering prowess.

Source: Foster + Partners

British Airways i360. Location: Brighton, England. Designed by: Marks Barfield, architect. Year built: 2016. Height: 162m. Marks Barfield鈥檚 拢46m follow-up to the London Eye features a single fully enclosed pod that travels up and down a vertical shaft to allow panoramic views of the southern English coast. While the venue receives almost 800,000 annual visitors and has led to other potential similar commissions across the world, the project has faced stern criticism from locals, some of whom claim it is 鈥減rofoundly out of keeping with the rest of the seafront鈥�.

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Orbit. Location: London, England. Designed by: Anish Kapoor, sculptor. Year built: 2012. Height: 114m. Arguably the only observation deck to double as a work of art, the Orbit is in fact Europe鈥檚 tallest public sculpture. The Orbit was a late addition to the Olympic Park masterplan for the London 2012 Olympic Games, with former mayor Boris Johnson seeking a cultural landmark for the park that would rival the Statue of Liberty. What he got was controversial steel abstraction of the five rings of the Olympic logo.

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Eiffel Tower. Location: Paris, France. Designed by: Gustave Eiffel, civil engineer. Year built: 1889. Height: 324m. The most famous observation tower in the world started out as a centrepiece of a world fair celebrating the centenary of the French Revolution. Despite coming in for savage criticism in its early years, it is now revered as an engineering marvel that has come to symbolise its city and country across the globe. So much so that even arch-rival London attempted its own version with the ill-fated Watkin鈥檚 Tower at Wembley in the 1890s.

Source: Shutterstock

Emirates Spinnaker Tower. Location: Portsmouth, England. Designed by: HGP Greentree Allchurch & Evans, architect. Year built: 2005. Height: 170m. The Millennium spawned the London Eye, which has gone on to enjoy astonishing levels of success. But though Spinnaker Tower was conceived to celebrate the event, it was dogged by a catalogue of problems. These ranged from a five-year delay in opening to the 鈥渨rong kind of wind鈥� causing a Plymouth council boss to get stuck in a lift in its opening ceremony. But today it is one of the leading visitor attractions on the South Coast.

Source: David Peter Robinson / Shutterstock

Space Needle. Location: Seattle, US. Designed by: John Graham & Company. Year built: 1962. Height: 184m. Like the Eiffel Tower, the Space Needle was developed for a World鈥檚 Fair and has gone on to become a defining symbol of its city. Also, like many similar structures of the same period, such as Sydney Tower and London鈥檚 BT Tower, it features a revolving restaurant. The tower鈥檚 elegant, tapering form belies astounding structural stability 鈥� it is designed to withstand Category 5 hurricanes and 9.1 magnitude earthquakes.

Source: Xuanlu Wang / Shutterstock

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Also read: The Tulip - a point of contention

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