Boring of the Vielha tunnel Historical milestone · Vilaller, Alta Ribagorça, Lleida Image of Vilaller, not of the place itself. With the works begun around 1926 and stopped by the Civil War, the boring was completed in 1941 with the labour of prisoners of war and it was not opened to traffic until 1948. At 5,240 metres it was the longest road tunnel in the world until 1964. 1926-1948 Photo: Efrainlarrea (CC BY-SA 3.0) What to see and do in Vilaller