San Boldo Pass, Mountain pass in Veneto, Italy
San Boldo Pass is a mountain road through the southern Alps connecting the Belluna valley with the Mareno valley. The route passes through five tunnels and crosses six bridges, with traffic controlled by signals.
During World War I, Austrian-Hungarian forces built this road in 1918 to establish a mountain crossing. The project employed prisoners of war and local workers to complete the route quickly.
The road earned the name 'Road of 100 Days' due to the rapid construction period that involved 1,400 workers operating in three continuous shifts.
The road is narrow and requires careful driving, especially through tunnels and tight curves. Visitors should drive slowly and watch for oncoming traffic, as signals control flow in both directions.
The road features eighteen hairpin turns within one kilometer, forming a vertical spiral structure through the mountain. This remarkable engineering achievement allows the route to gain significant elevation over a short distance.
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