Although most of the actions at the airport happen mostly above the ground, Sarajevo International Airport offers tourists the chance to explore the world underneath it. The Sarajevo Tunnel is also called the Tunnel of Hope. It was built in 1993 during the Bosnian War and it runs under the airport. This hidden gem was discovered by Laura DiBiase while traveling through Eastern Europe. Visitors can explore the tunnel which connected the Bosnian territories when the city was under attack by the Serbians. The tunnel was mainly used for keeping the territory alive, to transport the arms, supplies, and so on. The tunnel was also used by the UN controlling the airport for humanitarian aid. The best thing to do while at the airport is to tour the safe house before you catch your flight.