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Valle Mendoza | Railway tunnel near Guido
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Valle Mendoza | Túnel Caracoles
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Valle Mendoza | Túnel Cristo Redentor
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Santa Fé | Túnel Uranga Sylvestre
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Koralmtunnel
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Mur Valley with Raach and Pyhrn Motorway
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Semmering Tunnel
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Bosruck and Großer Pyhrgas
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Versamer Tobel | Rock slide deposit
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Monte Ceneri
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Lago di Lugano | Traffic lines
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Lago di Lugano | Melide
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Zipaquirá | Catedral de Sal
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Túnel de Sumapaz
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Entréves | Monte Bianco Tunnel
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Viadotto Italia
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Gorges du Tarn | Road tunnel
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Road 44 | Tunnel
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Lærdal Tunnel | Blue cave
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Lærdal Tunnel | Blue cave
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Magerøya | Nordkapp Tunnel
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Vardø Tunnel
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Quebrada Hualcán | Drainage tunnel of Laguna 513
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La Grande Chaloupe | Ancient railway tunnel
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Moscow | Metro Kievskaya
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Moscow | Metro Komsomolskaya
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Highway M34 | Istiqlol Tunnel