Main references:
Airports:
                La Palma (Spain)
                Bangok (Thailand)
 
Highways:
                Supersur (Bizkaia-Spain)
                M50 (Madrid- Spain)
Seaports:
                Izmir and Estambul (Turkey)
                Valencia (Spain)
Railways:
                Guadarrama Tunnel (Spain)
                Gotthard Tunnel (Switzerland)
                Sofia underground (Bulgaria)

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