The Al Wahda Arches (also called 5/6 Arch, Qatar Arch, Gateway Arch) is a monumental pair of 20° inclined steelarches, spanning the "5/6 interchange" of the Lusail expressway, Qatar which connects West Bay with Lusail City. It is the tallest monument in the country and has received a 2020 International Design Award[1] and 2018 ENR Global Best Project award.[5] Intended to be viewed while in motion as an "immersive public artwork", the arches are connected to each other by a cable net – a reference to Qatar's pearl diving heritage.[1] The structure itself consists of 54 large steel pieces, weighing over 9,000 tons, while the base of the arches are clad in Limra Limestone from Turkey.[2]
The monument, suspended viewing platform, and associated visitor centre were commissioned by Ashghal (the public works authority), designed by German architect Erik Behrens for AECOM,[6][7] engineering by Maffeis Engineering[8] and constructed by Eversendai – with an intended completion date of 2016.[9] At a cost of $74m, construction began in December 2013 and after partial completion was inaugurated along with the expressway for National Day celebrations in December 2017.[4][10] Due to construction occurring during the 2017 Qatar blockade the arches have taken on a local cultural significance of "resilience", and are now known as the 5/6 Arches (referring to 5 June when the diplomatic crisis began) along with "5/6 interchange" and the neighbouring "5/6 park".[4][11][12][13] The construction expressway interchange and Arches replaced the "Rainbow (Arch) roundabout" which used to stand on the site.[14][8]
In 2018 Ashghal and Qatar Post issued a set of commemorative stamps featuring the arches which integrated with an associated augmented reality phone application.[15]