Dubai - A bank of heavy fog creeps up on Dubai's towering skyscrapers, including the Burj Khalifa, at 829 m (2,722 ft) the tallest structure in the world.
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New York City - Birds circle the top of One World Trade Center as the sun sets and fog falls over lower Manhattan in New York City.
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Shanghai - Only the tallest of buildings on the Lujiazui Peninsula in Shanghai manage to pierce the fog that's settled over the city's futuristic financial district.
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London - London's Elizabeth Tower, which houses the Great Bell known as Big Ben, has a dreamlike quality about it as fog blankets the UK capital.
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Vilnius - The Vilnius TV Tower in Lithuania needles its way through a morning fog bank to appear as if suspended in clouds.
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Toronto - Toronto's emblematic CN Tower rears up from a sea of fog as seen from the city's BMO building.
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Tokyo - Japan's capital sparkles through low-level fog that threatens to envelop the entire city.
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Rio de Janeiro - Crowds gather at the foot of the famous Christ the Redeemer in Rio de Janeiro to capture the world-famous statue bathed in luminous fog.
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Istanbul - Istanbul's majestic Bosphorus Bridge, which spans the Bosphorus Strait, glows in a fuchsia wash above the fog line.
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Turin - Turin's 19th-century Mole Antonelliana pierces a blanket of winter fog that shrouds the northern Italian city.
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São Paulo - Cold weather arrives in Franca, a municipality in the state of São Paulo, Brazil, and brings with it a swirl of heavy fog.