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Valle Mendoza | Railway tunnel near Guido -
Valle Mendoza | Túnel Caracoles -
Valle Mendoza | Túnel Cristo Redentor -
Santa Fé | Túnel Uranga Sylvestre -
Koralm Tunnel | Construction site -
Mur Valley with Kirchdorf -
Mur Valley with Kirchdorf and Pernegg -
Mur Valley with Kirchdorf and Pernegg -
Mur Valley with Kirchdorf and Pernegg -
Semmering Railway and Rax -
Semmering Railway | Krauselklause Viaduct -
Semmering Railway | Krauselklause Viaduct -
Semmering Tunnel -
Bosruck and Großer Pyhrgas -
Lötschberg Railway | Lüegilkin Viaduct -
Lötschberg Railway | Lüegilkin Viaduct -
Lötschberg Base Tunnel | Southern entrance -
Brig | Simplon Tunnel -
Brig | Simplon Tunnel -
Versamer Tobel | Rock slide deposit -
Albula Valley | Landwasser Viaduct -
Albula Valley | Landwasser Viaduct with Glacier Express -
Albula Valley | Landwasser Viaduct -
Albula Valley | Landwasser Viaduct -
Monte Ceneri -
Lago di Lugano | Traffic lines -
Lago di Lugano | Melide -
Zipaquirá | Catedral de Sal -
Túnel de Sumapaz -
Entréves | Monte Bianco Tunnel -
Aosta Valley with Leverogne and Arvier -
Viadotto Italia -
Col du Galibier | Tunnel du Galibier -
Gorges du Tarn | Road tunnel -
Rijeka | Most Rječina -
Suburbs of Funchal with Câmara de Lobos -
Suburbs of Funchal with Câmara de Lobos -
Suburbs of Funchal with Câmara de Lobos -
Ribeira da Caldeira and Câmara de Lobos -
Quinta Grande | Via Rápida 1 -
Campanário with Via Rápida 1 -
Levada do Caldeirão Verde with tunnel -
Levada do Caldeirão Verde | Tunnel -
Maciço Montanhoso Central | Trail Pico do Arieiro - Pico Ruivo -
Maciço Montanhoso Central | Trail Pico do Arieiro - Pico Ruivo -
Road 44 | Tunnel -
Lærdal Tunnel | Blue cave -
Lærdal Tunnel | Blue cave -
Magerøya | Nordkapp Tunnel -
Vardø Tunnel -
Quebrada Hualcán | Drainage tunnel of Laguna 513 -
La Grande Chaloupe | Ancient railway tunnel -
Moscow | Metro Kievskaya -
Moscow | Metro Komsomolskaya -
Highway M34 | Istiqlol Tunnel