Patapat Viaduct. This viaduct connects Ilocos Norte and Cagayan provinces. It is an elevated concrete highway constructed along winding/rocky headlands. It was constructed to solve the problem of landslides in the area which have caused so many vehicular accidents in the past. Footed on the rocky seashore just several meters from the mountain side it gives motorists a spectacular view of Pasaleng Bay. The Patapat viaduct is more than 16 kilometers from Pagudpud, Ilocos Norte.