National Geographic Travelのインスタグラム(natgeotravel) - 1月21日 20時08分

Photo by @chiaragoia | Workers hang from the top of the Elbphilharmonie, a concert hall in Hamburg, to clean its windows. This procedure happens only three times a year, and it requires about three weeks of work each time to clean a surface of more than 16,000 square meters (about the size of two soccer fields!). Follow @chiaragoia for more. #elbphilharmonie #windowcleaning #hamburg #germany

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