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Valle Mendoza | Railway tunnel near Guido -
Valle Mendoza | Túnel Caracoles -
Valle Mendoza | Túnel Cristo Redentor -
Santa Fé | Túnel Uranga Sylvestre -
Koralmtunnel -
Mur Valley with Raach and Pyhrn Motorway -
Semmering Tunnel -
Bosruck and Großer Pyhrgas -
Versamer Tobel | Rock slide deposit -
Monte Ceneri -
Lago di Lugano | Traffic lines -
Lago di Lugano | Melide -
Zipaquirá | Catedral de Sal -
Túnel de Sumapaz -
Entréves | Monte Bianco Tunnel -
Viadotto Italia -
Gorges du Tarn | Road tunnel -
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