Sweden’s passport has been named the most powerful in the world, but it turns out it’s also one of the most highly sought-after travel documents on the black market. The latest research suggests Swedish passports are among the most frequently sold in underground trading, as there is no upper limit on the number of replacements available to the rightful holder. They can sell for as much as £6,000 each – far more than the £28 fee that Sweden’s government charges for new or renewed travel documents. Sweden's passport was among the most frequently sold travel documents on the black market . The findings are contained in a new GoEuro infographic which ranks the world’s most powerful passports and takes a look at quirky facts . When placed under an ultraviolet light a Canadian passport displays colourful images on its pages, including the Parliament building in Ottawa. The Finnish passport displays a walking moose when the pages are flipped, while the cover of Belgium’s passports offer three different sequences of languages, starting with Dutch, French or German. Meanwhile, the British passport is also one of the most powerful travel documents on the planet, but it doesn't come cheap. Britons have one of the most powerful passports in the world, allowing visa-free access to 174 countries . The study suggests that UK travellers are paying some of the highest passport costs in the world, with fees being far less in places such as Afghanistan, the United Arab Emirates, Czech Republic, China and Russia. Research by travel website GoEuro found that the British passport is the 11th most expensive of 51 countries included in the study, and it takes a worker earning minimum wage 11 hours to pay it off. The UAE has the most affordable passport at just £9, while Turkey has the most expensive at £166, said Berlin-based GoEuro. Based on its research the travel website named Sweden's passport the most powerful in the world. It allows visa-free entry into 174 countries – the same as Finland, Germany, the UK and the US – but was ranked No 1 by the website due to its cost. Swedes pay just £28 for a passport, with GoEuro claiming that it takes only one hour for the average worker to pay it off. Sweden doesn’t have a legal minimum wage, and salaries are determined through collective bargaining. When cost is used as the deciding factor, the UK passport is the fourth most powerful in the world – behind Sweden, Finland and Germany – with a fee of £73. In Liberia, it would take a worker earning minimum wage 278 hours to pay off the country's £33 passport. And it appears travellers around the world would love to get their hands on a UK passport. In a recent poll 20 per cent of those surveyed said they would choose a UK passport if they could get an extra nationality in addition to their own, even though it is one of the most expensive in the world. It was followed by passports for the US (18 per cent), Switzerland (17 per cent), Germany (10 per cent) and Canada and Australia with nine per cent each.
A British passport allows for visa-free access to 174 countries .
That is tied for the most, with Finland, Germany, Sweden and the US .
UK passport was 10th most expensive of 51 countries included in study .
The UAE, China, Russia and Czech Republic all pay less than the UK .